Siemens syngo CT 2005C - Manual (Page 306)

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Dynamic evaluation is a function which allows you to
analyze the absolute or relative enhancement of Houn-
sfield values within a Region of Interest.
The enhancement value is computed from a stack of
CT images which are obtained at different points in
time after contrast agent injection. For dynamic evalu-
ation, usually images from the same cross-section of
the body are taken, such as a Multi-scan through an
unclear process in the liver.
The time to the maximum enhancement (Time-to-
Peak) and the way a certain tissue or structure absorbs
the contrast medium can be very helpful in differential
diagnosis of a given process.
To do this, the Dynamic Evaluation card provides you
with the following methods:
• Evaluation on a separate syngo card on the user
interface.
• Selection dialog for slice positions to be evaluated in
Multi-slice studies.
• Volume data sets can be evaluated also, e.g., for
measurement of contrast enhancement in a vessel
during spiral acquisition and further optimization of
contrast injection procedure for follow-up studies.
• Dynamic evaluation of 5 different regions (circular
and irregular) and a pixel lens are possible in parallel.
• ROI definition and pixel lens are automatically cop-
ied to all pending images of the stack and show an
immediate display of the time-density curves, i.e. a
calculation can be done with only one interaction.
syngo Dynamic Evaluation
C2-025.630.01.01.02_APPLICATIONGUIDE_SPIRIT.book Page 306 Friday, April 8, 2005 9:55 AM