How to calculate the effective diameter of the output screen of the 9-inch image intensifier?

Image intensifiers are used in c-arm fluoroscopy, gastrointestinal machines and other equipment to transform X-rays into visible images. Although image intensifiers have been gradually replaced by dynamic flat-panel detectors, the c-arms of image intensifiers are currently used And the gastrointestinal machine is still very large, so how to calculate the effective diameter of the output screen of the 9-inch image intensifier?
In fact, this does not need to be calculated. The manufacturer of the image intensifier has indicated the diameter of the output screen and the size of the incident field on the nameplate of the image intensifier. For example, the effective diameter of the output screen of the 9-inch image intensifier produced by me is 20mm and 25mm. , Can be selected as required, the size of the incident field is about 215mm±2mm, and the voltage is 24VDC.
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Author:Lillian