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A customer consulted about the defocus of our X-ray grid

A customer consulted our company’s X-ray grid and wanted to know about the defocus of the convergent X-ray grid. Let me give you a brief introduction.
The converging x-ray grid is the plane of each absorbing grid, which converges into a straight line at a specified convergence distance. If the focal point of the X-ray tube is on a virtual straight line, since the projection of the X-ray absorption grid on the image receiving area is the smallest, the primary radiation transmittance is the largest.
Any deviation of the focal point from the virtual straight line at the convergence distance will cause the projection of the absorption grid on the image receiving area to increase, thereby reducing the primary radiation transmittance. The deviation can be perpendicular and/or parallel to the plane of the anti-scatter x-ray grid.
The deviation in the vertical direction will cause the difference between the focal point to the focal point of the X-ray grid and the convergence distance of the convergence grid. This difference is defined as defocus, which causes a non-uniform decrease in the primary radiation transmittance. The primary radiation transmittance will decrease in the direction from the actual centerline to the edge of the X-ray grid.
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X-ray grid

Author:Lillian


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