Section 12.0
MAN 06–0017H
ZIEHM QUANTUM User’s Manual Page 190 of 220
12.8.5. TEST RESULTS:
Example of testing is shown below:
If a radiation reading AKR of 6.5 mGy/min was seen during radiation test and was held on for 1
min the results would then equal 6.5mGy for the accumulated value.
mGy/min rate for 1 min = 6.5mGy accumulated. Rate mGy/min x time = accumulated mGy.
The value calculated during the test should be within +
10% for the previous monthly recorded
test value. If the system fails to calculate the dose within the tolerance of the previous monthly
test record, notify your local, authorized Ziehm Imaging, Inc. service center or dealer
representative for service.
12.8.6. DOSE CALIBRATION POINT:
Dose measurement calculation requires a fixed point that represents patient entry location.
The normal point would be 15 cm from the ISO center toward the source. However, the ZIEHM
QUANTUM does not have a single ISO center rather it has an elliptical ISO point. Therefore,
the measurement point has been determined by Ziehm Imaging, Inc. to be located 51 cm from
the source/focal spot toward the image receptor and represents the patient entry location for the
entry point. See Figure 12-4 below for location and dimensions.
The twice yearly service calibration and test requires specialized measurement hardware and
software to accurately determine the actual to calculated dose display values. Therefore, only
authorized Ziehm Imaging, Inc. service or a trained dealer service representative should attempt
to perform these operations
Compliance with the requirements of international standards (e.g. 21 CFR 1020.32-d (1), IEC
60601-2-43), Ziehm fluoroscopy systems with automatic dose rate control are not operable at any
combination of tube voltage and tube current which will result in an exposure rate in excess of 88
mGy/min at the point where the center of the useful beam enters the patient.
NOTE:
Calibration instruction can be found in the product technical manuals as Work
Instructions and should only be performed by authorized Ziehm Imaging, Inc. services
or a trained dealer representative.
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