28 Adjustments
ARCADIS Varic / Orbic SPR2-310.842.01.07.02 Siemens AG
12.06 CS SD 24
Page 28 of 34
Medical Solutions
X 2. Briefly release fluoro and measure the maximum and minimum diameter of the visible
X-ray field in full format (1/Fig.8/p.27).
¹ Open the X-iris to the maximum position in full format and note the diameter from
the centering cross.
¹ Close the X-iris to the minimum position in full format and note the diameter from
the centering cross.
X 3. Perform the collimator slot diaphragm adjustment under <Main System>-Adjust-
ments>-<Collimator slot diaphragm>.
¹ Make sure that the front edge of the slot diaphragm is accurately adjusted to the
edge of the I. I.
X 4. Briefly release fluoro and measure the minimum distance between the front edges of
the slot diaphragm in full format (1/Fig.9/p.27).
¹ Use 2.1mm Cu as prefilter to make the front edges visible.
¹ Close the slot diaphragm to the minimum position in full format and note the diam-
eter from the centering cross (front edge to front edge).
5. Insert the previously noted “open” and “closed” X-iris values and the “closed” slot dia-
phragm value under <Main System>-<Adjustment>-<Air Kerma> and click on <Save>.
¹ X-Iris Open Pos. in mm
¹ X-Iris Close Pos. in mm
¹ Slot diaphragm Close Pos. in mm (1/Fig.9/p.27).
¹ Slot diaphragm Open Pos. = remains at the default value
6. Remove the center cross and repeat the “air kerma accuracy check”.
NOTE
If the air kerma dose matching was not successful, perform the
"Wellhöfer chamber gain adjustment" and the “Wellhöfer cham-
ber test”. Then repeat the air kerma accuracy check.
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