The role of the input screen of the image intensifier

The image intensifier is mainly composed of input screen, input scintillation crystal, photocathode, vacuum tube and focusing electrode, output scintillation crystal, and output screen.
The principle of the image intensifier is that when X-rays pass through the human body, X-rays of different intensities are projected on the input screen according to the different densities of human tissues. The photocathode inside the phosphor screen generates different numbers of photoelectrons according to the intensity of fluorescence. , The photoelectrons of the photocathode are attracted by the positive potential of the anode and fly to the positive at high speed. The photoelectrons pass through the anode holes and are projected onto the output screen to produce a visible image. The image is brighter and smaller than the previous fluoroscopy image.
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Author:Lillian