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Quality Assurance
Low Contrast Test (Optional)
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04/2012
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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
Summary of Contents for SOMATOM Spirit
Page 4: ...0 0 0 0 ii SOMATOM Spirit0 0 ...
Page 8: ...0 0 0 0 vi SOMATOM Spirit0 0 ...
Page 55: ...Safety Information about Personal Safety 0 0 04 2012 0 0 A 2 130 0 A 2 ...
Page 72: ...0 0 0 0 Information about Personal Safety Safety A 2 30 SOMATOM Spirit0 0 ...
Page 84: ...0 0 0 0 Mechanical Safety Safety A 3 12 SOMATOM Spirit0 0 ...
Page 128: ...0 0 0 0 Software Related Safety Information Safety A 4 44 SOMATOM Spirit0 0 ...
Page 164: ...0 0 0 0 Console Related Safety Advice System Description B 4 8 SOMATOM Spirit0 0 ...
Page 190: ...0 0 0 0 Storage Media and Drives System Description B 6 6 SOMATOM Spirit0 0 ...
Page 198: ...0 0 0 0 System Handling C 2 SOMATOM Spirit0 0 ...
Page 230: ...0 0 0 0 Use of Storage Media System Handling C 3 14 SOMATOM Spirit0 0 ...
Page 234: ...0 0 0 0 Operation D 4 SOMATOM Spirit0 0 ...
Page 266: ...0 0 0 0 Function Tests Operation D 2 6 SOMATOM Spirit0 0 ...
Page 350: ...0 0 0 0 Maintenance E 2 SOMATOM Spirit0 0 ...
Page 362: ...0 0 0 0 Cleaning Agents and Disinfectants Maintenance E 2 6 SOMATOM Spirit0 0 ...
Page 366: ...0 0 0 0 Cleaning and Disinfecting Maintenance E 3 4 SOMATOM Spirit0 0 ...
Page 368: ...0 0 0 0 Quality Assurance F 2 SOMATOM Spirit0 0 ...
Page 376: ...0 0 0 0 General Information Quality Assurance F 1 8 SOMATOM Spirit0 0 ...
Page 384: ...0 0 0 0 Daily Quality Measurements Quality Assurance F 2 8 SOMATOM Spirit0 0 ...
Page 424: ...0 0 0 0 Constancy Test Quality Assurance F 3 40 SOMATOM Spirit0 0 ...
Page 436: ...0 0 0 0 Low Contrast Test Optional Quality Assurance F 4 12 SOMATOM Spirit0 0 ...
Page 439: ...Quality Assurance Camera Test 0 0 04 2012 0 0 F 5 30 0 Examples of test images F 5 F 5 ...
Page 450: ...0 0 0 0 Technical Specifications G 2 SOMATOM Spirit0 0 ...
Page 452: ...0 0 0 0 Standards and Statutory Regulations H 2 SOMATOM Spirit0 0 ...
Page 454: ...0 0 0 0 Forms J 2 SOMATOM Spirit0 0 ...
Page 456: ...0 0 0 0 DIP Report K 2 SOMATOM Spirit0 0 ...
Page 458: ...0 0 0 0 Location of Labels L 2 SOMATOM Spirit0 0 ...