Because the filter screen filters out the characteristics of the ray, it also absorbs a small part of the original emission line while filtering out the scattered line. Therefore, it is necessary to pay attention to the distance between the focus and the cassette at the time of use. Distance, the focal length should correspond to the focal length of the x ray grid, but it is difficult to make the two mutually correct due to the difference in body position and position taken in actual work.
In this case, a range value should be specified, and the change of the focal length of the specified range should be specified. The range shall not be greater than or less than 25% of the focal length, or the edge portion of the effective area of the grid shall have a pass rate of the original emission line of not less than 40%, which is the limit value.
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