Siemens AG SPR2-310.842.01.07.02 ARCADIS Varic / Orbic
12.06 CS SD 24
Adjustments 25
Page 25 of 34
Medical Solutions
Accuracy check
X 1. Briefly release fluoroscopy, select the <kV STOP> key and enter 70 kV at the control
console.
2. Note the measured DAP on the ARCADIS monitor as # 1 and set the external dose
meter to "0".
X 3. Release fluoroscopy until a measured dose (K
a
ext) of 4 - 5 mGy is displayed at the
external dose meter and note this value.
4. Note the area dose product (in cGycm
2
) displayed on the ARCADIS monitor as # 2 and
subtract # 1 from # 2 to get the dose (DAP int) to be compared to the external dose
meter.
5. Calculate the measured dose (K
a
ext) to the comparable dose area product (DAP ext )
in cGycm
2
:
¹ DAP ext = ( K
a
ext in mGy) x (diameter
2
in cm) x (0.829) / 10
NOTE
0.829 is the area calculation factor for the octagon.
6. Calculate the difference between the measured and displayed dose area product:
¹ Difference = [(DAP int) - (DAP ext)] / (DAP ext)
7. The maximum allowed difference is ± 0.25 (± 25%).
¹ PTW dose meter: For differences > +0.25 and < -0.25, perform the “PTW - cham-
ber test and adjustment”.
¹ Wellhöfer dose meter: For differences > +0.25 and < -0.25, perform the “Well-
höfer chamber gain adjustment”.
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