One side of the x-ray grid has a label, the side with a vertical label is upward, or the side with a label is upward. The cross mark used by the beam limiter should be aligned with the line in the middle of the x-ray grid.
What problems often arise in clinical placement of x-ray grid?
1, positive and negative inversion. 2. Plate tilt. 3. Focus error. 4. Displacement of the tube.
Author：Abby
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