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syngo CT 2007E Emotion Operator Manual
02/2008
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Information about Personal Safety Safety
A.2-32
Measurement related artifacts
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The most significant measurement related artifacts are the fol-
lowing:
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❏ Partial volume effects
❏ Beam hardening
❏ Metal artifacts
❏ Motion artifacts
Partial volume effects
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Thick slices are often preferred instead of thin slices. This helps
to increase signal to noise ratio and to limit the examination
time by reducing the number of slices. However, this may result
in partial volume effects. These are caused by high density tis-
sues (such as a bone) or objects (such as pacemakers) project-
ing only partly into the slice plane. One such well-known arti-
fact is the so-called Hounsfield bar between the petrous bones.
Other regions of the skull are also problematic with regard to
partial volume effects which are visible as dark streaks. Addi-
tional correction and / or special parameter settings (head
modes) help to minimize these effects.
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✧ To avoid partial volume effects use thinner slices.
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