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Information about Personal Safety
Safety
A.2-24
SOMATOM Spirit
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Beam hardening
A.2
When X-ray beams pass through tissue, the average energy of
the radiation spectrum is shifted towards higher energy. This is
known as
beam hardening
. It depends on the material density
and thickness of the tissue through which the X-ray beam
passes.
A.2
For body parts similar in density to water, for example, soft tis-
sue, the effect on the CT image can be compensated. In areas of
high density such as hips, shoulders or lower skull, hypodense
streaks and areas with reduced CT values can be seen. Along the
sides of the upper part of the skull, the so-called “cupping effect”
can be seen as a brightening of the CT values. The cupping
effect also occurs in rare cases such as infant skull tomograms,
due to residual extra focal radiation.
A.2
Additional corrections and/or special kernel parameter settings
(head modes) help to minimize these effects. Yet, they cannot
fully eliminate them.
A.2
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 ...
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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 ...
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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 ...
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