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The structure of the x ray grid?

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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