Setting The Semi-Transparent Slot Diaphragm; Manual Slot Diaphragm Calibration - Siemens ARCADIS Varic Operator's Manual

ARCADIS Varic
SPR2-310.620.30.02.02

Setting the semi-transparent slot diaphragm

The semi-transparent slot diaphragm is used primarily for collimation when imag-
ing the extremities.
Collimation enhances image contrast and reduces scattered radiation. Direct radi-
ation that passes the soft tissue laterally is reduced to such an extent that there
are no disturbing differences in brightness when images are viewed on the mon-
itor.
By rotating the slot diaphragm, the collimated field can be quickly oriented to the
direction of the anatomy under examination (e.g. the extremities).
Press one of the keys.
– The semi-transparent slot diaphragms are rotated to the left/right.
Press this key.
– The semi-transparent slot diaphragm is closed.
Press this key.
– The semi-transparent slot diaphragm is opened.

Manual slot diaphragm calibration

If it is determined during an intervention that the accuracy of the slot diaphragm
has deteriorated too much, a recalibration of the slot diaphragm can be per-
formed by pressing the buttons OPEN and CLOSE simultaneously and holding
them approx. 3 sec. This process lasts about 20 sec. During this time the kV and
mA indicators will flash. It is not possible to release radiation in this case.
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