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3.4 Beam Quality
Chapter 3
3.4.5 Performance Criteria and Corrective Action
Performance Criteria: After entering the data on the Table MP-3 (Beam Quality), the table will calculate Pass/Fail for
this test.
For 28kVp Mo/Mo the HVL must be over 0.30mm Al equivalent, and is typically <0.40 mm Al.
Typical HVL values for Mo/Mo and other target/filter combinations, as published by EUREF, are provided below.
These are for reference, and are optional.
HVL(mm Al) for target/lter combinations
kVp Mo/Mo Mo/Rh Rh/Rh W/Rh
25 0.33 +/- 0.02 0.40 +/- 0.02 0.38 +/- 0.02 0.52 +/- 0.03
28 0.36 +/- 0.02 0.42 +/- 0.02 0.43 +/- 0.02 0.54 +/- 0.03
31 0.39 +/- 0.02 0.44 +/- 0.02 0.48 +/- 0.02 0.56 +/- 0.03
Corrective Action: If the test fails, please repeat the above procedure. If results exceed the criteria the mammography
X-ray unit must be serviced to correct the condition.
The source of the problem shall be identied and corrective action shall be taken within 30 days of the test date. Pa-
tient examination may continue during this period.
3.4.6 Documentation
Record the results of the test in the Table MP-3 (Beam Quality) and the Table MP-S (MEDICAL PHYSICIST'S
MAMMOGRAPHY QC TEST SUMMARY).
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