In photography, it is necessary to pay attention to the focus of the X-ray tube to coincide with the convergence line so that the radiation direction of the original emission line is consistent with the direction of the lead strip and pass through the grid. If the focus of the X-ray tube and the convergence line of the grid are not When the grid is in the coincident state, or the grid is placed within the specified focal length range, the original emission line loss will occur too much.
The difference between the focus and the convergence line is larger, and the difference between the focal length and the focal length is the larger the volume, the greater the loss of the original emission line. It is also necessary to pay attention to the distance between the focus and the cassette. At this time, it is referred to as the focal length, and the focal length should correspond to the focal length of the grid. However, it is difficult to make the difference due to the difference in the position and position of the actual shooting. Mutual, at this time, a range value should be specified. The range of the focal length of the specified range cannot be greater than or less than 25% of the focal length, or the edge of the effective area of the grid should have a pass rate of less than 40%. It is the limit value.
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