The dynamic range of the X-ray image intensifier is large, it can output weak images and very bright images, and can output enhanced images with good contrast under different exposure doses.Therefore, the dynamic range response of the X-ray TV mainly depends on an aperture in the optical structure between the X-ray image intensifier and the camera to control and adjust. When the light output from the X-ray image intensifier is weak, the aperture is opened and the TV The camera receives all the imaging information from the X-ray image intensifier; conversely, when the X-ray image intensifier output light is very strong, the diaphragm will close to a very small, the TV camera only accepts the radiation from the central aperture of the diaphragm Light intensity information. Therefore, the adjustment of the size of the central aperture of the diaphragm can enable the X-ray TV to image the exposure information of different X-ray intensities. However, this is not the case with the TV cameras that follow. When the light level is too low, the resulting video image noise will be too large; conversely, when the light level is too high, saturation will occur and the image will all become brighter.
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