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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
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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
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 ...