900.12(e)(5)(viii): Uniformity of screen speed. Uniformity of the screen speed of all the cassettes in the facility shall be tested and the difference between the maximum and minimum optical densities shall not exceed 0.30. Screen artifacts shall also be evaluated during this test.
- Is uniformity of screen speed to be evaluated separately for each size or speed class of cassette or combined for all cassettes of all sizes and speed classes?
- My facility uses two distinct groups of small sized cassettes of different speed classes to image the standard breast. Must annual dose measurements be obtained for both groups of cassettes?
- Must the screen-film contact and uniformity of screen speed tests be performed on new cassettes prior to clinical use and must the medical physicist perform the tests?