image intendifier

The image intensifier  is the detector used in fluoroscopy, where an X-ray beam is continually applied to visualize movement in a real-time manner. X rays that interact with the input phosphor (usually CsI) release visible light photons. CsI crystals are grown as tiny pins, which, when arranged in the phosphor, provide very high resolution. Released photons from the input phosphor interact with the photocathode by a process called photoemission, which results in the release of electrons. These electrons are pulled toward the anode by 20 kV at the other end of the tube, and guided by electrostatic lenses to be focused on the output phosphor. Visible light photons released by the output phosphor may be recorded by a video camera or charge-coupled device (CCD)
camera.

Working Principle

X rays that hit the input phosphor of an image-intensifier tube release visible light. Light
photons react with the photocathode to produce electrons, which are guided to the anode by
electrostatic lenses. Electrons that hit the output phosphor, in turn, emit visible light, which may be
recorded by a video camera.

 source biomedic.me

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