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Safety
Information about Personal Safety
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syngo CT 2007E
Emotion Operator Manual
02/2008
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A.2-33
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Beam hardining
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, e.g., soft tissue, 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 cup-
ping effect also occurs in rare cases such as infant skull tomo-
grams, 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 Emotion syngo CT 2007E
Страница 4: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 ii ...
Страница 8: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 vi ...
Страница 44: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 General Safety Information Safety A 1 22 ...
Страница 59: ...Safety Information about Personal Safety 0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 A 2 150 0 A 2 ...
Страница 172: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Software Related Safety Information Safety A 4 78 ...
Страница 198: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Scan Unit Gantry System Description B 2 16 ...
Страница 240: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Console System Description B 5 24 ...
Страница 246: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Storage Media and Drives System Description B 6 6 ...
Страница 264: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 System Handling C 2 ...
Страница 268: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Operation of the Gantry System Handling C 1 4 ...
Страница 302: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Use of Accessories System Handling C 4 14 ...
Страница 334: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Switching the System On and Off Operation D 1 30 ...
Страница 340: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Function Tests Operation D 2 6 ...
Страница 426: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Maintenance E 2 ...
Страница 442: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Quality Assurance F 2 ...
Страница 450: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 General Information Quality Assurance F 1 8 ...
Страница 460: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Daily Quality Measurements Quality Assurance F 2 10 ...
Страница 520: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Low Contrast Test Optional Quality Assurance F 5 14 ...
Страница 526: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Camera Test Quality Assurance F 6 6 ...
Страница 536: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Technical Specifications G 2 ...
Страница 538: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Standards and Statutory Regulations H 2 ...
Страница 540: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Release Information J 2 ...
Страница 542: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Safety Instructions K 2 ...
Страница 544: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Forms L 2 ...
Страница 546: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 DIP Report M 2 ...
Страница 548: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Location of labels N 2 ...
Страница 566: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Glossary O 18 ...
Страница 574: ...0 0 syngo CT 2007E Emotion Operator Manual 02 2008 0 0 Index P 8 ...