Konica Minolta CS-3 - AEC Performance Checks

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3.13 AEC Performance Checks
5
The detector should be the same height as the top of the RMI phantom.
6
Make the exposure with 28 kVp in AEC mode.
7
Process the cassettes in the REGIUS Model 190/210/110HQ.
8
Note the mAs and mR of the image.
9
Repeat the process, from Step 1 through Step 8, three more times. Calculate the average
(mean) and the standard deviation of the four measurements and record them in the Table MP-
10 (CNR).
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Performance Criteria and Corrective Action
Performance Criteria: Calculate the coe󰀩cient of variation (CV) using the following formula. SD and Av stands for the
standard deviation and the average.
• CV = (SD / Av) × 100%
The coe󰀩cient of variation should be ≤ 5% for mAs.
Corrective Action: If the test results fall outside of these criteria, the test should be repeated.
If the problem remains, the source of the problem should be identied and corrective action shall be taken on the
component(s) that caused the failure within 30 days of the test date.
Patient examination may continue during this period.
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Documentation
Record this activity in the Table MP-10 (AEC Performance Checks (CNR) or AEC Performance Checks (S value))
and the Table MP-S (MEDICAL PHYSICIST'S MAMMOGRAPHY QC TEST SUMMARY).