In grid photography, one side has high density and the other side has low density. The reason may be that

The reason for this is that the shooting distance is inconsistent with the focus, the focus of the X-ray tube is biased to one side, and the grid position is incorrect.

1. The shooting distance is inconsistent with the focus: the shooting distance is consistent with the focus, but the grid plane is not perpendicular to the X-ray beam, and it inclines to one side at a certain angle, which will lead to uneven density on one side and low density on the other.

2. The focus of the X-ray tube is biased to one side, resulting in uneven irradiation of the X-ray beam on the irradiated object.

3. Incorrect grid position: In online photography, the grid should be placed between the film and the limb, and the distance from the focus to the grid should be equal to the focal length of the grid. If the grid position is offset, the developed photos will have density in the middle and no density on both sides, or have high density on one side and low density on the other.