Checking The Accuracy Of The Area Dose Product Measuring Device; Prerequisites; Preparations; Dose Measurement - Siemens ARCOSKOP Troubleshooting Manual

Adjustments / Programming
•
The test is concluded. Check the accuracy of the area dose product measuring device
(see next page).
Checking the accuracy of the area dose product measuring
device

Prerequisites

The calibration of the measuring device must already have been performed.
The X-Iris is correctly set; the blades are still just visible on the monitor screen.

Preparations

•
Attach the centering cross in the center of the I.I. (Fig. 9).
•
Select I.I. zoom format.
•
Select kV-mA-curve plateau IOD.
•
Attach the small (1 cm
NOTE
•
Release fluoroscopy briefly, adjusting the X-iris on the radiation field to a format of
approximately 8 cm.
•
Do not make any further adjustments to the X-Iris.
•
Record the inner diameter (key width, Fig. 11) of the octagonal area of the radiation field.
•
Remove the centering cross.
•
The measuring chamber is still in the center of the I.I. .

Dose measurement

•
Press the "Next Pat" key to reset the area dose product display on the ARCOSKOP
monitor to 0.
•
Select kV STOP and set manual to 70 kV.
•
Reset the dose measuring device (Dali, Nomex ...) to 0.
•
Release fluoroscopy for approx. 20 seconds (~ 3mGy). The measured dose K
be high enough that the selected measurement range of the dose measuring device
(Dali, Nomex...) is fully utilized; if necessary, reset the area dose product display on the
ARCOSKOP and the dose measuring device and repeat the measurement with a
different fluoroscopic time (Check these selections again: I.I. zoom format, kV-Stop,
70 kV).
•
Record the measured dose K
•
Record the area dose product FDPa displayed on the ARCOSKOP.

Calculating the area dose product

•
To calculate the measured area dose product: (measured area dose product FDPg) =
(measured dose K
Siemens AG
Medical Solutions
3
) dose measuring chamber in the center of the I.I. (Fig. 10).
The radiation field must cover the entire area of the dose measu-
ring chamber. If necessary, center the dose measuring chamber
on the I.I. again.
.
E
) * (inner diameter d)
E
SPR2-250.840.01
Rev. 01
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* 0.829.
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ARCOSKOP
System Manual