Siemens SOMATOM Emotion syngo CT 2007E Operator's Manual page 78

Information about Personal Safety
Metal artifacts
Motion artifacts
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syngo CT 2007E
02/2008
Metal objects such as tooth fillings, surgical clips, jewelry, hair
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clips, belts or hip prostheses etc. can cause extreme forms of
beam hardening artifacts. Depending on density and size, they
can lead to total absorption of the radiation. This results in cor-
responding strong black or white streaks or star-shaped arti-
facts.
Movement of organs in the slice or displacement of the entire
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slice during scanning likewise causes bright and dark artifacts.
These are usually seen as streaks or in areas of low density. To
reduce motion artifacts use the automatic patient instructions
(API) function for breathing and swallowing commands.
Greater difficulties are encountered with peristalsis. Heartbeat
artifacts are also problematic.
In sequence mode, a special reconstruction technique, the
Motion Artifact Correction Algorithm (MCA) is used to further
reduce motion artifacts (not selectable).
Safety
Emotion Operator Manual
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