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Quality Assurance
Low Contrast Test (Optional)
0.0
04/2012
0.0
F.4-11
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Evaluating the test
F.4
Normally one scan is sufficient to discern the pins in the row
with the smallest diameter (3 mm). However, the procedure
may be repeated if desired. Low contrast measurements are
directly effected by the level of noise (“sigma”) in the CT system,
which may vary from scan to scan within a specified range. Low
contrast estimations involve visual verification methods that are
somewhat subjective. It is normal to expect some variations in
assessing low contrast of the smallest (3 mm) pins.
F.4
✧
Adjust the window width and center to improve visualiza-
tion (adequate starting values: 30 width / 90 center).
✧
Observe the region where the small pins are located just
below the two 20 mm measurement areas.
i
.4
F
It may help to observe the image in a semi-darkened room and
from distance of up to 5 feet.
F.4
The low contrast test is in tolerance if the resolution is at least
5.0 mm.
F.4
f B
.4
F
Test is out of tolerance.
F.4
✧
Contact Siemens Customer Service.
F.4
Содержание SOMATOM Spirit
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Страница 55: ...Safety Information about Personal Safety 0 0 04 2012 0 0 A 2 130 0 A 2 ...
Страница 72: ...0 0 0 0 Information about Personal Safety Safety A 2 30 SOMATOM Spirit0 0 ...
Страница 84: ...0 0 0 0 Mechanical Safety Safety A 3 12 SOMATOM Spirit0 0 ...
Страница 128: ...0 0 0 0 Software Related Safety Information Safety A 4 44 SOMATOM Spirit0 0 ...
Страница 164: ...0 0 0 0 Console Related Safety Advice System Description B 4 8 SOMATOM Spirit0 0 ...
Страница 190: ...0 0 0 0 Storage Media and Drives System Description B 6 6 SOMATOM Spirit0 0 ...
Страница 198: ...0 0 0 0 System Handling C 2 SOMATOM Spirit0 0 ...
Страница 230: ...0 0 0 0 Use of Storage Media System Handling C 3 14 SOMATOM Spirit0 0 ...
Страница 234: ...0 0 0 0 Operation D 4 SOMATOM Spirit0 0 ...
Страница 266: ...0 0 0 0 Function Tests Operation D 2 6 SOMATOM Spirit0 0 ...
Страница 350: ...0 0 0 0 Maintenance E 2 SOMATOM Spirit0 0 ...
Страница 362: ...0 0 0 0 Cleaning Agents and Disinfectants Maintenance E 2 6 SOMATOM Spirit0 0 ...
Страница 366: ...0 0 0 0 Cleaning and Disinfecting Maintenance E 3 4 SOMATOM Spirit0 0 ...
Страница 368: ...0 0 0 0 Quality Assurance F 2 SOMATOM Spirit0 0 ...
Страница 376: ...0 0 0 0 General Information Quality Assurance F 1 8 SOMATOM Spirit0 0 ...
Страница 384: ...0 0 0 0 Daily Quality Measurements Quality Assurance F 2 8 SOMATOM Spirit0 0 ...
Страница 424: ...0 0 0 0 Constancy Test Quality Assurance F 3 40 SOMATOM Spirit0 0 ...
Страница 436: ...0 0 0 0 Low Contrast Test Optional Quality Assurance F 4 12 SOMATOM Spirit0 0 ...
Страница 439: ...Quality Assurance Camera Test 0 0 04 2012 0 0 F 5 30 0 Examples of test images F 5 F 5 ...
Страница 445: ...Quality Assurance Constancy Test of the Monitor 0 0 04 2012 0 0 F 6 50 0 Examples of test images F 6 F 6 ...
Страница 450: ...0 0 0 0 Technical Specifications G 2 SOMATOM Spirit0 0 ...
Страница 452: ...0 0 0 0 Standards and Statutory Regulations H 2 SOMATOM Spirit0 0 ...
Страница 454: ...0 0 0 0 Forms J 2 SOMATOM Spirit0 0 ...
Страница 455: ...0 0 04 2012 0 0 K 10 0 APPENDIX J 0 K DIP Report For further information please refer to System Owner Man ual K 0 ...
Страница 456: ...0 0 0 0 DIP Report K 2 SOMATOM Spirit0 0 ...
Страница 458: ...0 0 0 0 Location of Labels L 2 SOMATOM Spirit0 0 ...