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Constancy Test
Quality Assurance
F.3-24
SOMATOM Spirit
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Performing the MTF test
F.3
The
spatial resolution
is characterized through the modulation
transmission function (MTF). It describes the contrast amplitude
of bar patterns with different local frequencies shown in the
image relative to an ideal transmission.
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The 2% value of the MTF is the local frequency at which the con-
trast of periodical bar patterns of this local frequency is reduced
to 2%. In practice, the MTF values are determined using a single
thin wire.
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F.3
✧
Press the
Start
key on the control box.
Scanning is started.
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i
.3
F
After the previous test has been completed, the
MTF
test is
started automatically.
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The MTF is represented graphically as a function of the local fre-
quency (LP/cm). In addition, three characteristic values, 50%
MTF, 10% MTF and 2% MTF are displayed.
F.3
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 ...