Tune Up(System)

W tD u lo a c d M s n m ie S

Emotion (2007) / Spirit CT

Tune-up System Calibration of the CT system

This document is valid for: SOMATOM Emotion 6 (2007) SOMATOM Emotion 16 (2007) SOMATOM Spirit Power SOMATOM Spirit 10165977 10165888 10045692

Print No.: Replaces:

CT02-025.817.02.02.02 CT02-025.817.02.01.02

© Siemens AG

2006

The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved.

English Doc. Gen. Date: 06.07

2

Revision / Disclaimer

1Revision / Disclaimer

Document revision level The document corresponds to the version/revision level effective at the time of system delivery. Revisions to hardcopy documentation are not automatically distributed. Please contact your local Siemens office to order current revision levels. Disclaimer The installation and service of equipment described herein is to be performed by qualified personnel who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or one of its affiliates to provide such services. Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are directed to contact one of the local offices of Siemens or one of its affiliates before attempting installation or service procedures.

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0Table of Contents

1 _______ General ________________________________________________________ 8 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Important information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gantry / PHS adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMS adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System-specific information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 10 10 10

2 _______ Spirit / Spirit Power: Sequences __________________________________ 11 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Sequence for complete system tune-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Sequence in case of poor image quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Sequence in case of ring artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Sequence in case of fine streaks and/or MTF is out of tolerance. . . . . . . . . . . . . . . . . . 15 Sequence after tube replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Sequence after detector replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Sequence after replacing tube collimator box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Sequence after PSD Element replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Sequence in case of incorrect CT values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Sequence after HV tank, D400, or Power Box replacement . . . . . . . . . . . . . . . . . . . . . 21 Sequence after DMS Converter Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3 _______ Spirit / Spirit Power: Description __________________________________ 23 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Entry of system configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Copying the detector Tempcal table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Rotation speed adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Adaptation of the generator oscillator frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Tube gettering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Z-ADJUSTMENT of the tube collimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Table of Contents Z-position check of the tube diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Focus alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Focus alignment check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Generator adaptation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Filament adaptation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required tools and phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37 37 37 37

Warm-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Defective channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Examples: Screenshots defective channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic defective channel procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual defective channel procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

39 39 40 40 41

Channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Air calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Spacing correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Water Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Final work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Screen shot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quality assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

47 47 47 47

4 _______ Spirit / Spirit Power: Collimator adjustments ________________________ 48 Mechanical adjustment of the slotted plate in the collimator box . . . . . . . . . . . . . . . . . . Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Secure the adjustment screws with Loctite #243 . . . . . . . . . . . . . . . . . . . . . . . . . . .

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5 _______ Emotion (2007): Sequences with VB38 _____________________________ 53 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Sequence for complete system tune-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Sequence in case of poor image quality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Sequence in case of ring artifacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Sequence in case of fine streaks and/or MTF is out of tolerance. . . . . . . . . . . . . . . . . . 57 Sequence after tube replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Sequence after detector replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Sequence after replacing tube collimator box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Sequence after PSD Element replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Sequence in case of incorrect CT values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Sequence after HV tank, D400, or Power Box replacement . . . . . . . . . . . . . . . . . . . . . 63 Sequence after DMS converter board replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Sequence after a detector module replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6 _______ Emotion (2007): Description with VB38_____________________________ 66 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Entry of system configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Rotation speed adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Adaptation of the generator oscillator frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Tube gettering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Z-ADJUSTMENT of the tube collimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mechanical adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

71 71 71 72

Z-position check of the tube diaphragm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Focus alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Focus alignment check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

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Table of Contents Generator adaptation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Filament adaptation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required tools and phantoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

79 79 79 79

Warm-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Defective channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preliminary steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic defective channel procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Editing the defective channel table manually. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Results of defective channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

81 81 83 83 84 84

Channel Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 Air calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Spacing correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Water Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 Final work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Quality assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

7 _______ Emotion (2007): Mechanical collimator adjustments __________________ 93 Mechanical adjustment of the collimator box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Important information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

93 93 93 93

8 _______ Quality________________________________________________________ 98 Quality Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Constancy test functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing the position of the light markers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slice thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Water value and image pixel noise (NOISE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Homogeneity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Contrast scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High contrast resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tabletop positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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100 100 100 100 100 101 101 101

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Table of Contents

7

Acceptance test functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low-contrast resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dose in the system axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Topogram dose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dose rate profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tilt angle of the slice plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

102 102 102 102 102 103

9 _______ Changes to previous version ____________________________________ 104

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8

General 1-

Safety Information

0

General

0

1General

Only qualified and trained personnel are allowed to perform CT system installation, service, maintenance and quality assurance. To avoid any risk of injury to persons or damage to the system, the safety instructions must be read and observed in the: General Safety Notes (TD00-000.860.01.xx.xx) and Product-specific safety notes (CT02-025.860.02.xx.xx) (CT02-025.860.02 / Product-specific safety notes) The product-specific safety notes contain important information about:

• General safety information about the gantry, patient table, and laser products. • Attachment of screws and nuts, adjustment instructions for torque wrench and use of Loctite.

• Safety advice (Hazard keys)

High voltage NOTE

Dangerous voltages may be present. Switch off the main power supply before working on the system and secure the system against unintended switch-on. Allow at least two minutes discharge time after switching off the system. Prior to starting work on the components indicated below, measure the voltage level in the PDS (right gantry stand) between D450 X7 and X9 for Spirit, or between fuse holders F3.2(+) and F4.2(-) for Emotion 6/16 (2007). The voltage must be below 40 V DC.

Working in the gantry

• Prior to starting work in the gantry: - Wait until rotation has stopped - Disable gantry rotation via service switch S5 on MAS D301 - Use the mechanical brake to prevent gantry rotation while working in the gantry. - Connect the stationary and rotating part of the gantry with a ground cable before working in the gantry. NOTE

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Remove the cable prior to rotating the gantry.

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General

9

Automatic procedures NOTE

Do not leave the system unattended when a program is running with automatic movements or automatic radiation.

Radiation protection NOTE

Observe radiation protection regulations.

Bloodborne pathogens NOTE

Siemens AG Medical Solutions

Take appropriate precautions against exposure to bloodborne pathogens when handling parts of the system that may have come into contact with patients.

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General

Important information

1.1

Gantry / PHS adjustments

0

The adjustments for the PHS and Gantry (e.g. frequency converter for rotation or tilt) are described in the respective chapter in the document “Replacement of Parts Gantry / PHS“ (CT02-025.841.03).

IMS adjustments

0

The adjustments for the IMS system (e.g. monitor) are described in the document “Replacement of Parts IMS“ (CT02-025.841.04) in the respective replacement section.

System-specific information

0

NOTE

Only phantoms delivered with the CT system may be used for system adjustments.

NOTE

The density of the water in the phantom depends on the water temperature. Changing the water temperature by 1° Kelvin corresponds to changing the water equivalent to 0.3 HU (Hounsfield Unit) in the CT picture. The water phantom has to be stored at a constant temperature of 22° ±3° Celsius! For measurements, the water temperture in the phantom has to be 22° ±3° Celsius!

Emotion (2007) / Spirit

NOTE

Changing the vertical table position always changes the horizontal table position.

NOTE

NO other functions are allowed during the adjustment procedures.

NOTE

The gap of the plexi-strip has to be at the 11 o’clock position.

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Spirit / Spirit Power: Sequences General

2 Spirit / Spirit Power: Sequences

11

20

Safety

0

NOTE

Read and observe the safety information contained in the "Safety information" section of this document.(Safety Information / p. 8)

Phantoms

0

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Phantom holder:

Fig. 1:

Siemens AG Medical Solutions

Phantom holder

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Spirit / Spirit Power: Sequences

Sequence for complete system tune-up

2.1

For this sequence, an automated guided tour is available (partially).

• Entry of system configuration • Copy of the detector TEMPCAL CD • • • • • • •

Select Tune-up. Select Expert Mode. Select RotSpeed. Select GenOsc. Select Getter. Select ZAdjust. Select FocusAli.

• Insert plexi strip. • Select GenAdapt. • Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel Correction Beam Hardening Air Calibration Spacing Water Scaling

• Quality test • Save tables

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Spirit / Spirit Power: Sequences

13

Sequence in case of poor image quality

2.2

For this sequence, an automated guided tour is available (partially).

• • • • • • •

Select Tune-up. Select Expert Mode. Select ZAdjust. Select FocusAli. Insert plexi strip Select GenAdapt. Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel correction Beam Hardening Air Calibration Spacing Water Scaling

• Quality test • Save tables

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Spirit / Spirit Power: Sequences

Sequence in case of ring artifacts

2.3

For this sequence, an automated guided tour is available (partially).

• • • • •

Select Tune-up. Select Expert Mode. Select ZAdjust. Select ZCheck. Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel correction Beam Hardening Air Calibration Spacing Water Scaling

• Quality test • Save tables

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Spirit / Spirit Power: Sequences

15

Sequence in case of fine streaks and/or MTF is out of tolerance • • • • • • • • •

Siemens AG Medical Solutions

2.4

Select Tune-up. Select Expert Mode. Select ZAdjust. Select ZCheck. Select FocusAli. Insert plexi strip Select Air Calibration. Quality test Save tables

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Spirit / Spirit Power: Sequences

Sequence after tube replacement

2.5

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select Tube replacement. • Select X-ray Tube TuneUp. The following tune-up steps are called up automatically, one after the other: - Configuration - Getter - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Beam Hardening - Air Calibration - Water Scaling - Final work (quality test, save tables)

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Spirit / Spirit Power: Sequences

17

Sequence after detector replacement

2.6

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select Detector. The following tune-up steps are called up automatically, one after the other: - Configuration - TempCal - Remove def. channels - ZAdjust - Defective channels - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Beam Hardening - Air Calibration - Spacing - Water Scaling - Final work (quality test, save tables)

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Spirit / Spirit Power: Sequences

Sequence after replacing tube collimator box

2.7

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select Tube Collimator. The following tune-up steps are called up automatically, one after the other: - Configuration - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Beam Hardening - Air Calibration - Water Scaling - Final work (quality test, save tables)

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Spirit / Spirit Power: Sequences

19

Sequence after PSD Element replacement

2.8

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select PSD Element. The following tune-up steps are called up automatically, one after the other: - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Air Calibration - Water Scaling - Final work (quality test, save tables)

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Spirit / Spirit Power: Sequences

Sequence in case of incorrect CT values

NOTE

2.9

If the noise values and CT values are both out of tolerance, the probable cause is a partial loss of tube power (e.g. due to aging of the tube). You can correct this by performing a filament adaptation adjustment.

• Insert plexi strip • Select Tune-up. • Select Expert Mode. • Select Water Scaling. • Quality test • Save tables

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Spirit / Spirit Power: Sequences

21

Sequence after HV tank, D400, or Power Box replacement

2.10

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select HV tank, D400. The following tune-up steps are called up automatically, one after the other: - Configuration - GenOsc

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Spirit / Spirit Power: Sequences

Sequence after DMS Converter Board Replacement

2.11

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select DMS Converter. The following tune-up steps are called up automatically, one after the other: - Insert plexi strip - Air calibration - Final work (quality test, save tables)

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Spirit / Spirit Power: Description General

3Spirit / Spirit Power: Description

23

30

Safety

0

NOTE

Read and observe the safety information contained in the "Safety information" section of this document.(Safety Information / p. 8)

Phantoms

0

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Phantom holder:

Fig. 2:

Siemens AG Medical Solutions

Phantom holder

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Spirit / Spirit Power: Description

Entry of system configuration • • • • •

3.1

Change to service mode Options > Service > Local Service Select Configuration. Enter all system-specific settings in the configuration tool. After entering all settings, select Save. Select Home (system reboots automatically).

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Spirit / Spirit Power: Description Copying the detector Tempcal table

25 3.2

• Open the Explorer window (Ctrl + Esc). • Select c:\somaris\utils\LoadTempcal.bat. Follow the instructions in the program, e.g. Insert the CD Tempcal into the CD-ROM drive (and so on).

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Spirit / Spirit Power: Description

Rotation speed adjustment

3.3

General

0

The frequency converter is adjusted to obtain the correct rotation time for all rotation speeds. This procedure takes a few minutes.

Procedure • • • • • •

0

Remove all absorbers from the measurement field Change to the service mode Options >Service > Local Service Select Tune-up Select Expert Mode Select RotSpeed Select Go

• Press START • Select Go (to save the results) The message “Rotation speed completed“ appears.

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Spirit / Spirit Power: Description

27

Adaptation of the generator oscillator frequency

3.4

General

0

The components of the

• HV tank (H1) • D400 • Generator electronics box comprise a resonance circuit. As a result, it is necessary to determine the system-specific resonance frequency of these components. For this reason, the generator electronics (GEL) adjust to the optimal oscillator frequency during this procedure. The result is stored in the XRS controller. When replacing one of the above components, you have to repeat the adjustment procedure.

Procedure • • • • • • •

0

Remove all absorbers from the measurement field. Change to the service mode Options > Service > Local Service. Select Tune-up. Select Expert Mode. Select GenOsc. Select Go. Press START. This adjustment uses a special static mode and requires approximately 80 sec. Wait until the message "Generator Oscillatory Frequency completed" appears.

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Spirit / Spirit Power: Description

Tube gettering

3.5

General

0

Gettering is required after the X-ray tube is replaced or in response to frequent tube arcing. The getter procedure is used to:

• Check the HV behavior of the X-ray tube • Improve the HV stability of the X-ray tube, if insufficient • Guarantee the HV stability of a new X-ray tube This procedure is also known as “conditioning the X-ray tube.” After you start the procedure with the voltage selected, the program automatically performs a specific number of scans. If the tube arcs, the auto repeat function attempts to repeat the scans to obtain a specific number of scans without arcing. If the tube does not arc during these scans, the voltage is automatically switched to the next higher kV step. Gettering is completed when the highest kV step has been performed without tube arcing.

Procedure • • • • • • • •

0

Select Tune-up. Select Expert Mode. Select Getter. Select Start voltage (kV): 80 kV. Switch on "Auto repeat after tube arcing". Select Go. Press START. When all the steps of the gettering procedure have been completed without errors, the message "Gettering completed" appears.

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Spirit / Spirit Power: Description

29

Z-ADJUSTMENT of the tube collimator

3.6

General

0

The function of the Z-adjustment is to find the Z-position of the tube collimator where the maximum signal intensity is measured by the detector. First, the tube is heated up automatically ( > 1,000 K ). This is followed by a cool-down phase to a tube temperature of approx. 950 K. After that the Z-adjustment procedure starts. The adjustment starts with a defined movement of the tube-side diaphragm toward the back of the gantry. Measurements are taken incrementally with each position in the opposite direction. The optimal tube diaphragm positions for the low, middle, and high channels of the detector are determined in static mode (no rotation). In addition, the optimal positions for two rotation times are determined. During the adjustment, the diaphragm blades are moved accordingly.

Procedure • • • • • •

0

Select Tune-up. Select Expert Mode. Select ZAdjust. Select Go. Press START. After the Z-adjustment procedure has been finished: Select Go (to save the results). (The message "Z-adjustment of tube collimator successfully completed" appears).

Mechanical adjustment NOTE

0

The Z-adjustment procedure also checks whether the collimator is positioned parallel to the detector system. If the adjustment of the slotted plate in the collimator box is out of tolerance, the system has to be adjusted mechanically. To adjust the collimator box mechanically, the collimator adjustment tool is required (part no. 38 12 604).

If a mechanical adjustment is necessary, the following message appears during the Z-adjust procedure: The adjustment of the tube collimator is out of range. Click Cancel to start the adjustment procedure or Click Go to accept this adjustment.

• Select Cancel to start the mechanical adjustment procedure or select Go to accept this adjustment (for service purposes only; image quality may be poor)

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30

Spirit / Spirit Power: Description • Note the distance (micrometer) and the direction (clockwise or counterclockwise) the slotted plate of the collimator box has to be moved.

• Follow the procedure for mechanical adjustment (Spirit / Spirit Power: Collimator adjustments / p. 48).

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Spirit / Spirit Power: Description Z-position check of the tube diaphragm

31 3.7

General

0

To ensure a maximum output signal for the detector elements, the X-ray beam has to be centered precisely over the detector. The ZCheck procedure provides you with a quick check of the X-ray beam alignment. The reference value of the tube diaphragm determined via ZAdjust is the starting point of the quick check. The diaphragm is then shifted symmetrically in both Z-directions. The measured detector element output has to follow symmetrical thresholds, as long as the Z-adjustment is still within tolerance. This procedure is automatically added to the customer "check-up" procedure at specific intervals. If the result of the ZCheck is out of specification, please perform the ZAdjust procedure.

NOTE

There is no need to perform the ZCheck procedure if you have just completed the ZAdjust.

Procedure • • • • •

0

Select Tune-up. Select Expert Mode. Select ZCheck. Select Go. Press START. (The message “Z-Check completed“ appears.)

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Spirit / Spirit Power: Description

Focus alignment

3.8

General

0

The FocusAli procedure adjusts the electromagnetic focus deflection (flying focal spot) with respect to the parameters of different:

• Rotation times • Integration times of the DMS • Focus size To determine the electromagnetic behavior of the focus deflection circuit, the following adjustments are necessary:

• Phase: This step determines the synchronization (delay) between the DMS and focus deflection.

• Amplitude: Based on the neutral position, the amplitude of the focus deflection is determined in mm. With the phase specified, the amplitude is set so that the deflection equals half the width of one detector element.

• Offset: With the phase and amplitude specified, the offset of the focus deflection is set so that the central beam is exactly in the center of the detector. The procedure adjusts the settings for phase, amplitude, and offset for all combinations of these parameters.

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Procedure

0

• Position the alignment phantom in the measurement field.

Fig. 3:

Alignment phantom (10 mm al)

• Select Tune-up.

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Spirit / Spirit Power: Description • • • • • • •

33

Select Expert Mode. Select FocusAli. Select Phase, Amplitude, Offset and Calibration. Select Go. The Alignment phantom is selected (default). Select Go. Press START.

• Select Go (to save the results). The message "Focus Alignment completed" appears.

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34

Spirit / Spirit Power: Description

Focus alignment check

3.9

General

0

The FocusAli procedure adjusts the electromagnetic focus deflection (flying focal spot). The CheckAli procedure allows you to check the focus alignment by testing it with freely selectable parameters. CheckAli accesses the last set of raw data generated. Scan conditions:

• • • •

Combi phantom with alignment phantom and phantom holder (see Focus Alignment). Mode with complete rotation was used. Measurement data was processed, including calibration, and stored. Data was stored in raw data file.

The program checks whether the correct phantom was used in the scan. If not, the alignment check procedure will be interrupted and an error message is displayed. If the result of the CheckAli is out of specification, perform the FocusAli procedure.

Procedure • • • • • •

0

Select Tune-up. Select Expert Mode. Select CheckAli. Select Fused. Select the raw data file of the last measurement or any other file. Select Go. The message "CheckAli completed" appears.

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Spirit / Spirit Power: Description

35

Generator adaptation

3.10

(The Plexiglas strip has to be installed.)

General

0

The objective of the generator adaptation procedure is to set the generator parameters (filament current, tube current, and dose) so that a specific noise value is guaranteed across the complete power (kW) range. For this reason, the noise value (sigma) is measured in a 20 cm water phantom with different power (kW) steps. The generator adaptation has to be performed for:

• 2 predefined kV-steps and • 1 focal spot size The procedure adapts the settings for all combinations of these parameters.

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Procedure

0

• System phantom: Position the slice thickness phantom in the measurement field so that the light beam of the interior light markers is centered above the crossover point on the slice phantom.

Fig. 4:

System phantom

Pos. 1

Crossover point

• Select Tune-up. • Select Expert Mode. • Select GenAdapt.

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36

Spirit / Spirit Power: Description • • • • •

Select voltage (kV): 80 kV, 130 kV Only the large focus is used Select Go. Press START. Select Go (to save the results). The message “Generator adaptation completed“ appears.

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Spirit / Spirit Power: Description Filament adaptation

37 3.11

General

0

The objective of the FilAdapt procedure is to adapt the filament current to changes in the filament due to evaporation. The filament current is adjusted to reach the X-ray dose values determined via the GenAdapt procedure. The generator adaptation procedure optimizes the filament current, i.e. you do not have to perform the filament adaptation procedure after you have run a generator adaptation. This procedure is automatically added to the customer "check-up" procedure at specific intervals.

NOTE

There is no need to perform the filament adaptation procedure if you have just completed the generator adaptation.

Required tools and phantoms

0

n.a.

Procedure • • • • • •

0

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select FilAdapt. Select voltage (kV): 80 kV, 130 kV. Only the large focus is used.

• Select Go. • Press START. • Select Go (to save the results). The message “Filament adaptation completed“ appears.

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38

Spirit / Spirit Power: Description

Warm-up

3.12

(The Plexiglas strip has to be installed.)

General

0

The procedure is used to ensure a certain minimum (X-ray tube) temperature during table generation procedures. The procedure:

• is automatically skipped if the defined minimum temperature threshold has already been reached.

• is performed automatically by all following table generation procedures if the defined minimum temperature threshold has not been reached.

Procedure

0

• Remove all absorbers from the measurement field. • • • • •

Select Tune-up. Select Expert Mode. Select Warm Up. Select Go. Press START. Wait until the message “WarmUp completed“ appears.

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39

Defective channel correction

3.13

(The Plexiglas strip has to be installed.)

General

0

NOTE

After performing a “Defective channel correction” procedure, the tune-up steps “Channel Correction”, “Air Calibration”, and “Spacing” have to be performed.

Basically, defective channels are handled in two different ways: Automatic defective channel detection: Standard procedure recommended for service purposes.

NOTE

The program “automatic defective channel detection” deletes the old automatic defective channel list and subsequently creates a new automatic defective channel list. Channels requiring manual switch-off cannot be deleted via the automatic procedure. The program “automatic defective channel detection” is also performed during the “checkup” procedure. However, the detected defective channels are valid only temporarily until the next “checkup” procedure is performed. No additional tune up steps are required after the “checkup” procedure.

Manual defective channel detection: To switch off defective channels manually, special detector knowledge about multislice techniques is required. Manual defective channel correction is performed only if the defective channel cannot be detected automatically (e.g. values are too rough or problem is sporadic).

NOTE

Siemens AG Medical Solutions

Channels switched off manually can be reactivated only by using the same manual procedure.

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Spirit / Spirit Power: Description

Examples: Screenshots defective channels

Fig. 5:

Defective channels

Fig. 6:

Defective channels (slice selection)

0

Automatic defective channel procedure NOTE

• • • • • • •

0

After performing a “Defective channel correction” procedure, the tune-up steps “Channel Correction”, “Air Calibration”, and “Spacing” have to be performed.

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select Defective Channels. Automatic Detection after Editing is enabled (default). Select Go. Press START. Wait until the window is refreshed.

• Select Go.

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Spirit / Spirit Power: Description

41

• Select Go (to save the result). Wait until the message "Procedure Defective Channels completed" appears.

Manual defective channel procedure NOTE

0

To switch off defective channels manually, special detector knowledge about (multi) slice techniques is required. Manual defective channel correction is performed only if the defective channel cannot be detected automatically (e.g. values are too rough or problem is sporadic). Channels that are switched off manually can be reactivated only by using the same manual procedure.

• • • • •

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select Defective Channels. Disable Automatic Detection after Editing.

• Select Correction Tables > Tune-up. Select the affected Tune-up table.

• Select the number of the Detector Slot. (Detector slots containing defective channels are highlighted in red.)

• Mark the defective channels/slices with “1”. To activate the setting, click with the left mouse button anywhere in the defective channel window. The defective channels are then highlighted in red.

• Select Go. • Select Go (to save the result). Wait until the message “Procedure Defective Channels completed“ appears.

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Spirit / Spirit Power: Description

Channel correction

3.14

(The Plexiglas strip has to be installed.)

General

0

The ChannelCorrection procedure compensates for the difference in attenuated signals from detector element to detector element. The correction has to be made for different scan parameters (e.g. kV, slice width, etc.) as well as the density of the absorbers and the path covered within an absorber. For this reason, head and body absorbers are used when determining the correction tables. The correction tables comprise linear and square root parts.

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Procedure • • • • • • •

0

Select Tune-up. Select Expert Mode. Select Channel Correction. Switch on check (a check measurement is performed). Click select all (all modes are selected). Select Go. Insert the CCR body phantom according to the program instructions. Move the phantom into the slice plane so that the START mark on the phantom corresponds to the light beam of the interior light marker.

Fig. 7:

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Channel correction phantom (body)

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Spirit / Spirit Power: Description

43

• Select Go. • Press START. • After the CCR body correction has been made, insert the CCR head phantom according to the program instructions.

Fig. 8:

Channel correction phantom (head)

• Select Go. • Press START. Wait until the message “Channel Correction completed“ appears.

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Spirit / Spirit Power: Description

Air calibration

3.15

(The Plexiglas strip has to be installed.)

General

0

The channels of the measurement system have different levels of sensitivity that are compensated for by Air Calibration. Air calibration consists of two major steps, base calibration and difference calibration. The objective of base calibration is to determine the changes in sensitivity caused by present environmental conditions. For this reason, base calibration has to be performed on a daily basis. This function is selected automatically when the system is switched on. In addition, the customer can run base calibration under “Setup > Calibration”, as required. The objective of the difference calibration procedure is to determine the structural differences in sensitivity for the various scan modes (kV, mA, slice width, rotation time, etc.). For this reason, difference calibration tables are generated during tune-up only. Air calibration checks whether an absorber is in the X-ray beam. If the message indicates “There may be an object in the scan field...” although no absorber is in the X-ray beam, the reason could be contrast on the plexi strip, a defective channel, or the adjustment of the collimator box (ZAdjust). With softwware version VB15, wait times between the KV steps are no longer required.

Procedure • • • • • • •

0

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select Air Calibration. Click select all (all modes are selected) Select Go. Press START. Wait until the message “Air Calibration completed“ appears.

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Spirit / Spirit Power: Description Spacing correction

45 3.16

(The Plexiglas strip has to be installed.)

General

0

This procedure is used to correct the equidistance (mechanical) behavior of the single detector elements. These so-called "spacing errors" can result in visible artifacts in tomograms. The Spacing correction mathematically equalizes the different distances of the single detector elements. For this reason, a spacing correction table is created to compensate for spacing errors during image reconstruction.

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Procedure

0

• Position the spacing phantom in the measurement field.

Fig. 9:

• • • • • •

Spacing phantom

Select Tune-up. Select Expert Mode. Select Spacing. Click Select all. Select Go. Press START. Wait until the message “Spacing completed“ appears.

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46

Spirit / Spirit Power: Description

Water Scaling

3.17

(The Plexiglas strip has to be installed.)

General

0

The density of water is defined as 0 HU on the Hounsfield scale. To ensure this condition, each measurement value is multiplied by a scaling factor during pre-processing. These scaling factors are determined via the WaterScaling procedure function. The scaling factors have to be generated for each scan parameter (kV, slice width, etc.).

NOTE

To avoid that incorrect adjustment values are created during tune up, only phantoms delivered with the CT system may be used for system adjustments. Also the water phantom has to have the same temperature as that in the examination room.

Procedure

0

• System phantom: Position the slice thickness phantom in the measurement field so that the light beam of the interior light markers is centered above the crossover point on the slice phantom.

Fig. 10: System phantom Pos. 1

• • • • • •

Crossover point

Select Tune-up. Select Expert Mode. Select Water Scaling. Click select all (modes). Select Go. Press START. Wait until the message “Water scaling completed“ appears.

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Spirit / Spirit Power: Description Final work

47 3.18

Screen shot

0

Fig. 11: Final work

Quality assurance

0

• Select Quality Assurance in the main menu of the Service Software. • Perform the Quality Constancy test.

Backup

0

• • • • • • •

Siemens AG Medical Solutions

Select Backup & Restore in the main menu of the Service Software. From Command, select Backup. From Drives, select a backup media or drive, e.g. [-R-] CD-R. From Packages, select CT-Scanner and click Go. Wait until "Ready" appears in the status line. From Packages, select SW-Settings02 and click Go. Wait until "Ready" appears in the status line.

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48

Spirit / Spirit Power: Collimator adjustments 4-

Mechanical adjustment of the slotted plate in the collimator box

0

Safety

0

4Spirit / Spirit Power: Collimator adjustments

NOTE

Read and observe the safety information contained in the "Safety information" section of this document.(Safety Information / p. 8)

General

0

Remark:

1 2

4

To mechanically adjust the slotted plate in the collimator box, the collimator adjustment tool (part no. 38 12 604) is required.

6 A

5

(Additional information: The collimator adjustment tool is a part of the spare part collimator box).

3

Tube

3

Fig. 12: Collimator adjustment tool

Procedure

0

• Switch off the gantry and secure it against unintended switch-on. • Remove the gantry’s front covers and front funnel. • Move the tube into the 6 o’clock position. • Engage the mechanical rotation brake.

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Spirit / Spirit Power: Collimator adjustments

49

Function description:

1 2

4

1

6 A

Tube

3

The slotted plate of the collimator box is adjusted in parallel to allow the slotted plate to be moved about the pivot screw (rotation point).

5

3

2

The slotted plate is pushed toward the back of the gantry by turning the large wheel clockwise.

Fig. 13: Collimator box Pos. 1

Pivot screw

Pos. 2

Large wheel

The slotted plate is pulled toward the front of the gantry by a spring inside the collimator box (the large wheel of the adjustment screw is turned counterclockwise).

• Preparation: Turn the adjustment pin

1 2

4

(1/Fig. 15 / p. 50) of the collimator adjustment tool back to a length where the pin does not touch the slotted plate of the collimator.

6 A

5

• Attach the collimator adjustment tool with three screws on the right side of the collimator box (torque: 3 Nm, ±10%).

3

Tube

3

Fig. 14: Attach the adjustment tool

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50

Spirit / Spirit Power: Collimator adjustments • Turn the small adjustment wheel 1

1 2

4

(Pos. 3) clockwise, until the adjustment pin contacts the slotted plate of the collimator and the friction clutch of the small wheel is activated (free run).

6 A

5

• To tighten the adjustment pin to the

2

3

3

3

Tube

collimator with the correct torque, turn the large wheel by 1 unit (= 10µm) clockwise (Pos.2).

Fig. 15: Adjustment procedure (a) Pos. 1

Adjustment pin

Pos. 2

Large wheel

Pos. 3

Small wheel

• Loosen the pivot screw (Pos. 2) by 1 turn.

1 2

41

A

2

Tube

3

• Loosen the left screw (Pos.1, M3

6

hex-socket) by 1 turn.

5

3

Fig. 16: Adjustment procedure (b) Pos. 1

Left screw

Pos. 2

Pivot screw

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Spirit / Spirit Power: Collimator adjustments

51

• Loosen the two right screws (Pos.1, M3 hex-socket) by 1 turn. 1

1 2

4

• Now turn the large wheel of the

6 A

adjustment tool (Pos. 2), according to the distance (micrometer) and the direction (clockwise or counterclockwise) calculated with the Z-adjust program. Important! Please note: 10 micrometer = 1 unit (segment) on the collimator adjustment tool (Example: 40µm = 4 units).

5

2

Tube

3

3

Fig. 17: Adjustment procedure (c)

T

Pos. 1

Right screws

Pos. 2

Large wheel

• Tighten the three screws, (1/Fig. 16 / p. 50) and (1/Fig. 17 / p. 51), crosswise (torque: 1.3 Nm ±10%).

• Tighten the pivot screw (torque: 0.62 Nm ±10%) (2/Fig. 16 / p. 50). • Release the adjustment pin from the slotted plate. (Turn the large wheel of the adjustment tool approx. (2/Fig. 17 / p. 51) four turns counterclockwise).

• • • •

Remove the collimator adjustment tool (Fig. 14 / p. 49) from the gantry. Release the mechanical rotation brake. Switch on the gantry. Check the new adjustment of the slotted plate. (Note: The ZAdjust procedure is still running.) Select Go. If the message: “The adjustment of the tube collimator is out of range“ appears, select Cancel and repeat the mechanical adjustment procedure again. If the message: “Found tube collimator DISPLACEMENT ... (Tolerance ± 15µm)“ appears, select Start rotation in the window: “The gantry covers are open. Are you sure nobody is inside?“ The Z-adjustment procedure continues.

• After the Z-adjustment procedure has completed, select Go (to save the results). (The message “Z-adjustment of tube collimator successfully completed“ appears.)

• Secure the adjustment screws with Loctite #243 (Secure the adjustment screws with Loctite #243 / p. 52).

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Spirit / Spirit Power: Collimator adjustments

Secure the adjustment screws with Loctite #243 • • • •

0

Switch off the gantry and secure it against unintended switch-on. Move the tube into the 6 o’clock position. Engage the mechanical rotation brake. Secure the four screws of the slotted plate (including washers) with Loctite #243 (1, 2/Fig. 16 / p. 50) / (1/Fig. 17 / p. 51).

• Release the mechanical rotation brake. • Wait 10 minutes for the Loctite to harden. (In the meantime, the front funnel and front covers of the gantry can be installed).

• Switch on the gantry. • This completes the procedure for mechanically adjusting the collimator box.

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Emotion (2007): Sequences with VB38 General

5Emotion (2007): Sequences with VB38

53

50

Safety

0

NOTE

Read and observe the safety information contained in the "Safety information" section of this document. (Safety Information / p. 8)

Phantoms

0

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.

Phantom holder for Emotion 6/16 (2007):

Fig. 18: Phantom holder (Emotion 6 / 16)

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Emotion (2007): Sequences with VB38

Sequence for complete system tune-up

5.1

For this sequence, an automated guided tour is available (partially).

• Entry of system configuration • • • • • • • •

Select Tune-up. Select Expert Mode. Select RotSpeed. Select GenOsc. Select Getter. Select ZAdjust. Select FocusAli. Insert plexi strip

• Select GenAdapt. • Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel correction Air Calibration Spacing Water Scaling

• Quality test • Save tables

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Emotion (2007): Sequences with VB38

55

Sequence in case of poor image quality

5.2

For this sequence, an automated guided tour is available (partially).

• • • • • • •

Select Tune-up. Select Expert Mode. Select ZAdjust. Select FocusAli. Insert plexi strip Select GenAdapt. Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel correction Air Calibration Spacing Water Scaling

• Quality test • Save tables

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Emotion (2007): Sequences with VB38

Sequence in case of ring artifacts

5.3

For this sequence, an automated guided tour is available (partially).

• • • •

Select Tune-up. Select Expert Mode. Select ZAdjust. Select Table Generation. The following tune-up steps are selected automatically, one after the other: -

Insert plexi strip (already inserted) Defective channels Channel correction Air Calibration Spacing Water Scaling

• Quality test • Save tables

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57

Sequence in case of fine streaks and/or MTF is out of tolerance • • • • • • • •

Siemens AG Medical Solutions

5.4

Select Tune-up. Select Expert Mode. Select ZAdjust. Select FocusAli. Insert plexi strip Select Air Calibration. Quality test Save tables

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Emotion (2007): Sequences with VB38

Sequence after tube replacement

5.5

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select X-ray Tube TuneUp. The following tune-up steps are called up automatically, one after the other: - Configuration - Getter - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Air Calibration - Water Scaling - Final work (quality test, save tables)

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59

Sequence after detector replacement

5.6

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select Detector. The following tune-up steps are called up automatically, one after the other: - Configuration - Remove def. channels - ZAdjust - Defective channels - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Air Calibration - Water Scaling - Final work (quality test, save tables)

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Emotion (2007): Sequences with VB38

Sequence after replacing tube collimator box

5.7

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select Tube Collimator. The following tune-up steps are called up automatically, one after the other: - Configuration - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Channel correction - Air calibration - Water Scaling - Final work (quality test, save tables)

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61

Sequence after PSD Element replacement

5.8

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select PSD Element. The following tune-up steps are called up automatically, one after the other: - ZAdjust - FocusAli - Insert plexi strip - GenAdapt - Air Calibration - Water Scaling - Final work (quality test, save tables)

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Emotion (2007): Sequences with VB38

Sequence in case of incorrect CT values

NOTE

5.9

If the noise values and CT values are both out of tolerance, the probable cause is a partial loss of tube power (e.g. due to aging of the tube). You can correct this by performing a filament adaptation adjustment.

• Insert plexi strip • Select Tune-up. • Select Expert Mode. • Select Water Scaling. • Quality test • Save tables

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63

Sequence after HV tank, D400, or Power Box replacement

5.10

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select HV tank, D400. The following tune-up steps are called up automatically, one after the other: - Configuration - GenOsc

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Emotion (2007): Sequences with VB38

Sequence after DMS converter board replacement

5.11

For this sequence, an automated guided tour is available.

• Select Tune-up. • Select DMS Converter. The following tune-up steps are called up automatically, one after the other: - Insert plexi strip - Air Calibration - Final work (quality test, save tables)

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65

Sequence after a detector module replacement

5.12

Perform the following tune up steps (expert mode) and follow the guided tours:

• • • • • • • •

Select Tune-up and then perform only the following steps of the automated tour: Defective channels (no more defective channels shown for the new module) ZAdjust Insert plexi strip Channel correction Air correction Spacing Water Scaling

Finally assure that the quality constancy routine is within tolerance.

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66 General

6Emotion (2007): Description with VB38

Emotion (2007): Description with VB38 60

Safety

0

NOTE

Read and observe the safety information contained in the "Safety information" section of this document. (Safety Information / p. 8)

Phantoms

0

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.

Phantom holder for Emotion 6 / 16 (2007):

Fig. 19: Phantom holder (Emotion 6 / 16)

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Siemens AG Medical Solutions

Emotion (2007): Description with VB38 Entry of system configuration • • • • •

Siemens AG Medical Solutions

67 6.1

Change to service mode Options > Service > Local Service Select Configuration. Enter all system-specific settings in the configuration tool. After entering all settings, select Save. Select Home (system reboots automatically).

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Emotion (2007): Description with VB38

Rotation speed adjustment

6.2

General

0

The frequency converter is adjusted to obtain the correct rotation time for all rotation speeds. This procedure takes a few minutes.

Procedure • • • • • •

0

Remove all absorbers from the measurement field. Change to the service mode Options > Service > Local Service. Select Tune-up. Select Expert Mode. Select RotSpeed. Select Go.

• Select Go (to save the results). The message "Rotation speed completed" is displayed.

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69

Adaptation of the generator oscillator frequency

6.3

General

0

The components of the

• HV tank (H1) • D400 • Generator electronics box comprise a resonance circuit. As a result, it is necessary to determine the system-specific resonance frequency of these components. For this reason, the generator electronics (GEL) adjust to the optimal oscillator frequency during this procedure. The result is stored in the XRS controller. The adjustment uses a special static mode and requires approximately 80 sec. When replacing one of the above components, you have to repeat the adjustment procedure.

Procedure • • • • • • •

0

Remove all absorbers from the measurement field. Change to the service mode Options > Service > Local Service. Select Tune-up. Select Expert Mode. Select GenOsc. Select Go. Press START. The message "Generator Oscillatory Frequency completed" appears.

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Tube gettering

6.4

General

0

Gettering is required after the X-ray tube is replaced or in response to frequent tube arcing. The getter procedure is used to:

• Check the HV behavior of the X-ray tube • Improve the HV stability of the X-ray tube, if insufficient • Guarantee the HV stability of a new X-ray tube This procedure is also known as “conditioning the X-ray tube.” After you start the procedure with the voltage selected, the program automatically performs a specific number of scans. If the tube arcs, the auto repeat function attempts to repeat the scans to obtain a specific number of scans without arcing. If the tube does not arc during these scans, the voltage is automatically switched to the next higher kV step. Gettering is completed when the highest kV step has been performed without tube arcing.

Procedure • • • • • • • •

0

Select Tune-up. Select Expert Mode. Select Getter. Select Start voltage (kV): 80 kV. Switch on "Auto repeat after tube arcing". Select Go. Press START. When all steps of the gettering procedure have been completed without errors, the message "Gettering completed" appears.

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71

Z-ADJUSTMENT of the tube collimator

6.5

General

0

The function of the Z-adjustment is to find the Z-position of the tube collimator where the maximum signal intensity is measured by the detector. First, the tube is heated up automatically ( > 1,000 K ). This is followed by a cool-down phase to a tube temperature of approx. 950 K. After that the Z-adjustment procedure starts. The adjustment starts with a defined movement of the tube-side diaphragm toward the back of the gantry. Measurements are taken incrementally with each position in the opposite direction. The optimal tube diaphragm positions for the low, middle, and high channels of the detector are determined in static mode (no rotation). In addition, the optimum positions of all collimator slots are determined in rotation mode. During the adjustment, the diaphragm blades are moved accordingly.

Procedure • • • • •

0

Select Tune-up. Select Expert Mode. Select ZAdjust. Select Go. Press START. For mechanical adjustment, refer to:(Emotion (2007): Mechanical collimator adjustments / p. 93)

• After the Z-adjustment procedure has finished, select Go (to save the results). (The message "Z-adjustment completed" appears.)

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Mechanical adjustment NOTE

0

When adjusting the collimator box mechanically, at least one aluminum foil spacer (part no. 38 15 136) is required. For Emotion 6 (2007): Mechanical adjustment of the collimator box is necessary only if the measured ZAdjust value exceeds a tolerance of ± 30 µm. For Emotion 16 (2007): Mechanical adjustment of the collimator box is necessary only if the measured ZAdjust value exceeds a tolerance of ± 20 µm.

If a mechanical adjustment is necessary, the following message appears during the Z-adjust procedure: The adjustment of the tube collimator is out of range. Click Cancel to start the adjustment procedure or Click Go to accept this adjustment.

• Select Cancel to start the mechanical adjustment procedure, or select Go to accept this adjustment (for service purposes only; image quality may be poor).

• Follow the procedure for mechanical adjustment (Emotion (2007): Mechanical collimator adjustments / p. 93)

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Emotion (2007): Description with VB38 Z-position check of the tube diaphragm

73 6.6

General

0

To ensure a maximum output signal for the detector elements, the X-ray beam has to be centered precisely over the detector. The ZCheck procedure provides you with a quick check of the X-ray beam alignment. The reference value of the tube diaphragm determined via ZAdjust is the starting point of the quick check. The diaphragm is then shifted symmetrically in both Z-directions. The measured detector element output has to follow symmetrical thresholds, as long as the Z-adjustment is still within tolerance. If the result of the ZCheck is out of specification, please perform the ZAdjust procedure.

NOTE

There is no need to perform the procedure if you have just completed the .

Procedure • • • • •

0

Select Tune-up. Select Expert Mode. Select ZCheck. Select Go. Press START. (The message "Z-Check completed" appears.)

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Emotion (2007): Description with VB38

Focus alignment

6.7

General

0

The FocusAli procedure adjusts the electromagnetic focus deflection (flying focal spot) with respect to the parameters of different:

• Rotation times • Integration times of the DMS • Focus sizes (small/large) To determine the electromagnetic behavior of the focus deflection circuit, the following adjustments are necessary:

• Phase: This step determines the synchronization (delay) between the DMS and focus deflection.

• Amplitude: Based on the neutral position, the amplitude of the focus deflection is determined in mm. With the phase specified, the amplitude is set so that the deflection equals half the width of one detector element.

• Offset: With the phase and amplitude specified, the offset of the focus deflection is set so that the central beam is exactly in the center of the detector. The procedure adjusts the settings for phase, amplitude, and offset for all combinations of these parameters.

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.(Fig. 19 / p. 66)

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Procedure

0

• Combi phantom: Position the phantom in the slice plane so that the starting point on the phantom corresponds to the light beam of the inner light marker.

Fig. 20: Combi phantom Emotion 16 Pos. 1

• • • • • • • •

Starting point

Select Tune-up. Select Expert Mode. Select FocusAli. Select Phase, Amplitude, Offset Select Go. Select combi phantom or system phantom. Select Go. Press START.

• Select Go (to save the results). The message "Focus Alignment completed" appears.

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Focus alignment check

6.8

General

0

The FocusAli procedure adjusts the electromagnetic focus deflection (flying focal spot). The CheckAli procedure allows you to check the focus alignment by testing it with freely selectable parameters. CheckAli accesses the last set of raw data generated. Scan conditions:

• • • •

Combi phantom with alignment phantom and phantom holder (see Focus Alignment). Mode with complete rotation was used. Measurement data was processed, including calibration, and stored. Data was stored in raw data file.

The program checks whether the correct phantom was used in the scan. If not, the alignment check procedure will be interrupted and an error message is displayed. If the result of the CheckAli is out of specification, perform the FocusAli procedure.

Procedure • • • • • •

0

Select Tune-up. Select Expert Mode. Select CheckAli. Select Fused. Select the raw data file of the last measurement or any other file. Select Go. The message "CheckAli completed" appears.

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Generator adaptation

6.9

(The plexi-strip has to be installed).

General

0

The objective of the generator adaptation procedure is to set the generator parameters (filament current, tube current, and dose) so that a specific noise value is guaranteed across the complete power (kW) range. For this reason, the noise value (sigma) is measured in a 20 cm water phantom with different power (kW) steps. The generator adaptation has to be performed for:

• 3 predefined kV-steps and • 2 different focal spot sizes. The procedure adapts the settings for all combinations of these parameters. Additional Information: Please note that there is no kV adaptation for Emotion 6/16 (2007) systems.

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.(Fig. 19 / p. 66)

Procedure

0

• System phantom:Position the slice thickness phantom in the measurement field so that the light beam of the inner light markers is centered above the crossover point on the slice phantom.

Fig. 21: System phantom Pos. 1

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Crossover point

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Emotion (2007): Description with VB38 • • • • • • •

Select Tune-up. Select Expert Mode. Select GenAdapt. Select voltage (kV): 80 kV, 110 kV, 130 kV. Select focus: small and large. Select Go. Select the inserted phantom Select Go.

• Press START. • Select Go (to save the results). The message "Generator adaptation completed" appears.

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79 6.10

General

0

The objective of the FilAdapt procedure is to adapt the filament current to changes in the filament due to evaporation. The filament current is adjusted to reach the X-ray dose values determined via the GenAdapt procedure. The generator adaptation procedure optimizes the filament current, i.e. you do not have to perform the filament adaptation procedure after you have run a generator adaptation. This procedure is automatically added to the customer Check-up procedure at specific intervals.

NOTE

There is no need to perform the filament adaptation procedure if you have just completed the generator adaptation.

Required tools and phantoms

0

n.a.

Procedure • • • • • •

0

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select FilAdapt. Select voltage (kV): 80 kV, 110 kV, 130 kV. Select focus: small and large.

• Select Go. • Press START. • Select Go (to save the results). The message "Filament adaptation completed" appears.

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Warm-up

6.11

(The plexi-strip has to be installed).

General

0

The WarmUp procedure is used to ensure a certain minimum (X-ray tube) temperature during table generation procedures. The procedure:

• is automatically skipped if the defined minimum temperature threshold has already been reached.

• is performed automatically by all following table generation procedures if the defined minimum temperature threshold has not been reached.

Procedure

0

• Remove all absorbers from the measurement field. • • • • •

Select Tune-up. Select Expert Mode. Select Warm Up. Select Go. Press START. Wait until the message "WarmUp completed" appears.

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81

Defective channel correction

6.12

General

0

NOTE

To avoid image artifacts: After performing a “defective channel correction” procedure and a new defective channel is detected, or a defective channel is reactivated, the tune-up steps “Channel Correction”, “Air Calibration”, and “Spacing” have to be performed.

Basically, defective channels are handled in two different ways: Automatic defective channel detection: Standard procedure recommended for service purposes.

NOTE

The program “automatic defective channel detection” deletes the old automatic defective channel list and subsequently creates a new automatic defective channel list. Channels requiring manual switch-off cannot be deleted via the automatic procedure. The program “automatic defective channel detection” is also performed during the “checkup” procedure. However, the detected defective channels are valid only temporarily until the next “checkup” procedure is performed. No additional tune up steps are required after the “checkup” procedure.

Editing the defective channel table manually: To switch off defective channels manually, special detector knowledge about multislice techniques is required. Manual defective channel correction is performed only if the defective channel cannot be detected automatically (e.g. values are too rough or problem is sporadic).

NOTE

Channels switched off manually can be reactivated only by using the same manual procedure.

Example: Screenshot regarding defective channels For Emotion 16 (2007):

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Fig. 22: Defective Channels - Emotion 16 (2007) Pos. 1

Select collimation when patching defective channels manually.

Pos. 2

When patching a channel manually, first select the affected detector slot and then the faulty channel.

For Emotion 6 (2007):

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Fig. 23: Defective Channels - Emotion 6 (2007) Pos. 1

Select Collimation when patching defective channels manually.

Pos. 2

When patching a channel manually, first select the affected detector slot and then the faulty channel.

Preliminary steps

0

• The gantry has to be closed and the system has to be in operation. • Ensure that during table generation the system is operating under the ambient conditions specified: If the gantry was in standby mode and rotation was inactive for a while, you should rotate the gantry for at least 10 minutes prior to generating tables. If the gantry was switched off completely and the next step involves table generation, you should rotate the gantry for at least 20 minutes prior to generating tables.

Automatic defective channel procedure

0

• Remove all absorbers from the measurement field.

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Emotion (2007): Description with VB38 • • • • • •

Select Tune-up. Select Expert Mode. Select Defective Channels. For automatic detection, select Auto in the lower navigation bar Press START to perform automatic detection of defective channels. The Defective Channels Corrections screen is displayed automatically to display the results of the defective channel correction.

• The message "Procedure Defective Channels completed" indicates that the procedure has completed successfully.

Editing the defective channel table manually

0

• Select Tune-up. • Select Expert Mode. • Select Defective Channels. • Select the Correction Table that will be patched manually. • Mark the affected Detector Slot by selecting the number with a mouse click. The selected detector slot is highlighted.

• Mark the defective channels and the affected slices by selecting the channel number in all affected slices with a mouse click. Detector slices are displayed from left to right, detector channels are displayed from top to buttom. The correction table, the detector slot, and the defective detector channels are highlighted in red.

• Select Save. • The Defective Channels Corrections screen is displayed automatically to display the results of the defective channel correction.

Results of defective channel correction

0

Defective channel history Every channel that has been detected is displayed under

• Local Service > Reports > Tune-Up/QA/Tests > Def. Chann. History Results of defective channel measurements A list of the defective channel measurements performed is displayed under

• Local Service > Reports > Tune-Up/QA/Tests > Tune-up > Table Generation > Def. Channels (to view the results, double-click the report of interest).

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Channel Correction

6.13

(The plexi-strip has to be installed).

General

0

The ChannelCorrection procedure compensates for the difference in attenuated signals from detector element to detector element. The correction has to be made for different scan parameters (e.g. kV, slice width, etc.) as well as the density of the absorbers and the path covered within an absorber. For this reason, head and body absorbers are used when determining the correction tables.

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.(Fig. 19 / p. 66)

Procedure

0

• Combi phantom: Position the phantom in the slice plane so that the starting point on the phantom corresponds to the light beam of the interior light marker.

Fig. 24: Combi phantom Emotion 16 Pos. 1

• • • • • •

Siemens AG Medical Solutions

Starting point

Select Tune-up. Select Expert Mode. Select Channel Correction. Switch on check (default, a check measurement is performed). Click select all (all Body and Head Modes are selected). Select Go.

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Emotion (2007): Description with VB38 • Select the inserted phantom Select Go.

• Press START. Wait until the message "Channel Correction completed" appears.

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Emotion (2007): Description with VB38 Air calibration

87 6.14

(The plexi-strip has to be installed).

General

0

The channels of the measurement system have different levels of sensitivity that are compensated for by Air Calibration. Air calibration consists of two major steps, base calibration and difference calibration. The objective of base calibration is to determine the changes in sensitivity caused by present environmental conditions. For this reason, base calibration has to be performed on a daily basis. This function is selected automatically when the system is switched on. In addition, the customer can run base calibration under “Setup/Calibration”, as required. The objective of the difference calibration procedure is to determine the structural differences in sensitivity for the various scan modes (kV, mA, slice width, rotation time, etc.). For this reason, difference calibration tables are generated during tune-up only. Air calibration checks whether an absorber is in the X-ray beam. If the message “There may be an object in the scan field...” is displayed and no absorber is in the X-ray beam, the reasons could be contrast on the plexi-strip, a defective channel, or the adjustment of the collimator box (ZAdjust).

Procedure • • • • • • •

0

Remove all absorbers from the measurement field. Select Tune-up. Select Expert Mode. Select Air Calibration. Click all modes. Select Go. Press START. Wait until the message "Air Calibration completed" appears.

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Spacing correction

6.15

(The plexi-strip has to be installed).

General

0

This procedure is used to correct the equidistance (mechanical) behavior of the single detector elements. These so-called "spacing errors" can result in visible artifacts in tomograms. The Spacing correction mathematically equalizes the different distances of the single detector elements. For this reason, a spacing correction table is created to compensate for spacing errors during image reconstruction.

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.(Fig. 19 / p. 66)

Procedure

0

• Combi phantom: Position the phantom in the slice plane so that the starting point on the phantom corresponds to the light beam of the interior light marker.

Fig. 25: Combi phantom Emotion 16 Pos. 1

• • • •

Starting point

Select Tune-up. Select Expert Mode. Select Spacing. Select Go.

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• Select the inserted phantom Select Go.

• Press START. Wait until the message "Spacing completed" appears.

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Emotion (2007): Description with VB38

Water Scaling

6.16

(The plexi-strip has to be installed).

General

0

The density of water is defined as 0 HU on the Hounsfield scale. To ensure this condition, each measurement value is multiplied by a scaling factor during pre-processing. These scaling factors are determined via the WaterScaling procedure function. The scaling factors have to be generated for each scan parameter (kV, slice width, etc.).

NOTE

The density of water is a function of its temperature. A difference of +10 Kelvin (18 degrees Fahrenheit) results in a difference of -3 HU on the CT scale. For reproducible scaling factors, the water temperature inside the phantom has to be the same for all procedures (QUALITY/CONSTANCY). For this reason, it is recommended that the water phantom be stored in the scan room to ensure a constant water temperature level. Approx. 5 hours are required for the water in the phantom to compensate for a 10 Kelvin difference in temperature (18 degrees Fahrenheit).

NOTE

Only the original phantoms (delivered with the system) can be used. The vertical and horizontal positioning of the phantom is performed automatically at a predefined table height. For this reason, only the original phantom holder (delivered with the system) can be used.(Fig. 19 / p. 66)

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Procedure

0

• System phantom:Position the slice thickness phantom in the measurement field so that the light beam of the inner light markers is centered above the crossover point on the slice phantom.

Fig. 26: System phantom Pos. 1

• • • • • •

Crossover point

Select Tune-up. Select Expert Mode. Select Water Scaling. Click select all (modes). Select Go. Select the inserted phantom Select Go.

• Press START. Wait until the message "Water scaling completed" appears.

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Final work

6.17

Quality assurance

0

• Select Quality Assurance in the main menu of the Service Software. • Perform the Quality Constancy test.

Backup

0

• • • • • • •

Select Backup & Restore in the main menu of the Service Software. From Command, select Backup. From Drives, select a backup media or drive, e.g. [-R-] CD-R or [-G-] MOD. From Packages, select CT-Scanner and click Go. Wait until "Ready" appears in the status line. From Packages, select SW-Settings02 and click Go. Wait until "Ready" appears in the status line.

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7-

Mechanical adjustment of the collimator box

0

Safety

0

7Emotion (2007): Mechanical collimator adjustments

NOTE

Read and observe the safety information contained in the "Safety information" section of this document. (Safety Information / p. 8)

Important information NOTE

0

When adjusting the collimator box mechanically, at least one aluminum foil spacer (part no. 38 15 136) is required. A mechanical adjustment of the collimator box is necessary only if the measured ZAdjust value exceeds the tolerance for Emotion 6: ± 30 µm, or Emotion 16: ± 20 µm. The thickness of one aluminum foil spacer is 25 µm. Due to the mechanical position of the aluminum foil spacer, one spacer results in a total correction of 40 µm (factor 1.6).

Procedure

0

Explanation of the collimator adjustment: NOTE

Definition “left and right” of the collimator box: The collimator has to be in a 6 o’clock position and the view direction has to be from the table to the gantry.

The following procedure shows the adjustment on the left collimator side. The adjustment on the right collimator side (spindle/motor side) has to be performed accordingly.

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Emotion (2007): Mechanical collimator adjustments

1

2

Fig. 27: Aluminium foil spacer Pos. 1

Opening for the guide pin

Pos. 2

Holes for the set screws

1

2

Fig. 28: Back of collimator Pos. 1

Opening for the guide pin

Pos. 2

Thread for the set screws

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1 2

3 Fig. 29: Correct position of the aluminium foil Pos. 1

Opening for the guide pin

Pos. 2

Set screws

Pos. 3

Aluminium foil spacer

Fig. 30: Insert the aluminium foil

Working steps:

• Switch off the gantry and secure it against unintended switch-on. Observe the high voltage guidelines

• • • • •

Remove the front funnel and the back funnel of the gantry. Move the tube into the 6 o’clock position. Engage the mechanical rotation brake. Release the four screws of the collimator box by approx. 2 mm. Push the collimator box in the table direction (approx. 2 mm) to obtain the space needed for inserting the aluminum foil.

• Remove the two screws of the collimator box on the side where the aluminum foil has to be added. Attention: The view direction of the collimator box is from the table to the gantry.

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Emotion (2007): Mechanical collimator adjustments • Insert the aluminum foil according to the ZAdust program (Fig. 30 / p. 95) : Place n pieces of foil on the left side. or Place n pieces of foil on the right side (spindle side).

• To obtain the correct position of the aluminum foil, the left and right edge of the aluminum foil have to be aligned parallel to the collimator box (Fig. 29 / p. 95) . Insert the two removed screws of the collimator box and tighten them by hand.

• • • •

Tighten the four screws of the collimator box with a torque of 40 Nm. Release the mechanical rotation brake. Switch on the gantry. Check the new adjustment of the collimator box. (Note: The Z-Adjust procedure is still running.) Select Go. If the message: "The adjustment of the tube collimator is out of range" appears, select Cancel and repeat the mechanical adjustment procedure again. If the message: "Found tube collimator DISPLACEMENT ..........." is displayed, select Start rotation in the window: "The gantry covers are open. Are you sure nobody is inside?" The Z-adjustment procedure continues.

• After the Z-adjustment procedure has been finished, select Go (to save the results). (The message "Z-adjustment of tube collimator successfully completed" is displayed.)

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• When the mechanical adjustment of the collimator is successful, cut off the top of the aluminum foil (the part above the collimator surface) to avoid scratching the back funnel.

Fig. 31: Aluminum foil spacer Pos. 1

Cut off the top of the aluminum foil spacer

• Install the front funnel and the back funnel.

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Quality 8-

Quality Procedure

8Quality

0

Fig. 32: Set of phantoms

• Attach the phantom set to the support bracket at the front of the patient table. • Set the gantry tilt to 0 degrees (vertical). • Place a 70 kg weight on the tabletop (at the foot-end of the patient table). • Raise the patient table to a height of 145 mm (display). • Switch on the light markers and position the slice thickness phantom in the measurement field.

• Change to service mode Options > Service > Local Service. • Select QualityAssurance. • Select Constancy or Acceptance. (For installations in Germany, the ACCEPTANCE TEST must be used to satisfy the requirements set forth in paragraph 16 of the German law for X-ray products.)

• Select Go. • Enter your name. • Select Go. • Follow all program sequences.

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Quality

99 • Ensure that each individual measurement result is in tolerance.

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Quality

Constancy test functions

8.1

Testing the position of the light markers

0

• Position the slice thickness phantom in the measurement field so that light beams of the interior light markers are centered above the upper cross markins on the phantom.

• Perform the measurement and evaluate the Z-position of the measurement phantom in the slice plane.

• The phantom has to be positioned precisely in the Z-direction of the slice plane. The Z-position is correct when the long and short bars overlap in the tomogram.

Slice thickness

0

Slice thickness is tested using the slice thickness phantom. The phantom contains two aluminum strips 100 x 25 x 0.2 mm. The following are prerequisites for accurately determining the slice thickness:

• The phantom has to be centered in the measurement field and may not be tilted forward.

• The phantom has to be positioned precisely in the Z-direction of the slice plane. • Both aluminum strips have to be positioned horizontally in the tomogram. • The program uses the tomogram to compute the actual slice thickness for all selectable slice thicknesses.

Water value and image pixel noise (NOISE)

0

• The water phantom is positioned in the center of the measurement field. • In each tomogram, the CT numbers are measured in a test area. • The pixel noise is calculated from two tomograms of the water phantom taken in sequence using the standard deviation of the CT numbers of a defined test area in the difference image.

• In addition, this test determines the high voltage at the X-ray tube.

Homogeneity

0

• The water phantom is positioned in the center of the measurement field. • In each tomogram, the CT numbers are measured in a total of five test areas. (Each test area covers between 2% and 5% of the slice area of the phantom.)

• The absolute value of the difference between the average CT number of the center test area and the CT numbers of the four peripheral test areas is the homogeneity.

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101

Contrast scale

0

• The contrast scale (CS) indicates the change in attenuation coefficient of a water-equivalent material required to change the average CT number of this material by 1.

• An air measurement is performed to determine the contrast scale.

High contrast resolution

0

• The spatial resolution during high contrast is determined by evaluating the MTF. • A wire phantom and special evaluation software are used to calculate the MTF. • The resolution is displayed in line pairs per centimeter (LP/cm) for 50% MTF, 10% MTF, and 2% MTF.

Tabletop positions

0

A 70 kg weight is positioned on the tabletop (at the foot-end). After attaching a label to the moving and stationary parts of the patient table, the tabletop is automatically fed in and fed out at a defined distance. Follow the program instructions.

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102

Quality

Acceptance test functions

8.2

Low-contrast resolution

0

An image of the low-contrast phantom is generated while positioned in the center of the measurement field. The spatial resolution is visually evaluated for low contrast. The 5 mm holes have to be visible in the image of the phantom.

Dose in the system axis

0

• Center an ionization chamber axially in the system axis so that the slice plane runs through the center of the chamber.

• The ionization chamber has to be connected to a special dosimeter. • The length dose product (LDP/mGy x cm) displayed by the dosimeter is manually entered in the input field (ZZ = number of detector rows).

• The program computes the dose in the system axis according to the following formula:

Dose(mGy )

LDP ( mGy cm ) -------------------------Sl i ce thickness (cm) x

Fig. 33: Dose in the system axis

Topogram dose

0

• An ionization chamber is attached to the tabletop. • The chamber is centered axially in the measurement field to ensure that the chamber is fully irradiated during the topogram.

• The ionization chamber is connected to a special dosimeter. • The length dose product (LDP/mGy x cm) displayed by the dosimeter is manually entered in the input field.

• The program computes the dose in the system axis according to the following formula:

Dose(mGy )

LDP ( mGy cm ) ---------------------chamber length (cm

Fig. 34:Topogram dose

Dose rate profile

0

• The dose rate profile is measured in air with an X-ray film.

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103 • A CCR-phantom should be used as the film holder. Position the upper edge of the phantom in the center of the gantry (tolerance 5 mm).

• Position the film in the system axis and perpendicular to the main beam. • Move the film in the Z-direction prior to each scan with a different slice thickness. • After the film is developed, average the entire width of each exposed strip and manually enter it in the input field.

Tilt angle of the slice plane

0

• The position of the slice plane changes by the same amount. The deviation between mechanical and electronic display of tilt angles from +15° to -15° is measured; the deviation is entered manually in the input field.

• Measure the tilt angle mechanically using a spirit level on the gantry cover. • The tilt angle displayed by the system may not deviate from the measured angle by more than 2 degrees.

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Emotion (2007) / Spirit

104 9Changes to previous version

Changes to previous version 9-

Chapter

Change

Reason

Cover page

Spirit Power has been added

n.a.

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