Special Examinations; Subtraction Angiography (Sub) - Siemens ARCADIS Varic Operator's Manual

Progression
Landmark
ARCADIS Varic
SPR2-310.620.30.02.02

Special examinations

The following optional operating modes require special procedures deviating
from the standard examination:

Subtraction angiography (SUB)

Roadmap
After incorrect operation, it may be necessary for the user to repeat certain pro-
cedures, e.g. administering of contrast agent.
Subtraction angiography (SUB)
During the examination, images without contrast medium (mask) are continuous-
ly subtracted from images with contrast medium and displayed on the monitor.
Depending on the contrast medium flow, they display the relevant vascular seg-
ment without superimposition in real time.
The subtraction angiography is divided into three phases:
Phase A
Time until the mask is completed (permanently defined)
Phase B1
The time from the "inject" display on the monitor up to when the injection
medium has reached the area to be examined
Phase B2
Time of the actual exposure of the examination region
If Auto Save is activated in the configuration menu, you should enter the duration
for phase B1 and the storage transfer rate for phases B1 and B2 in that menu.
Thus the image memory is not overloaded with unnecessary images.
( Register 8: Configuration, Page 18)
In some cases it is useful to see the anatomy surrounding the contrast-filled
blood vessels. This can be configured gradually prior to the examination using the
Landmark function.
( Register 8: Configuration, Page 18)
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