The X-ray image intensifier is the most critical device in the X-ray TV system, and its technical performance has a great influence on the work and image quality of the whole machine.
The main technical parameters of the X-ray image intensifier are: field of view, output image diameter, image resolution, image contrast, X-ray absorption rate, conversion coefficient, etc., as well as vacuum, signal-to-noise ratio, gray scale and other technical parameters. The output image diameter represents the image diameter of the effective input field of view on the output screen under the specified electrode voltage, which is generally 15mm, 20mm, 30mm. Image resolution Under the condition of X-ray tube voltage of 45kV and tube current of 0.1mA, place the input screen of the X-ray image intensifier 1m away from the center of the tube, and place heavy metals that do not pass through the X-ray in front of the input screen Line, and according to the resolution test card composed of different gaps, observe the number of black and white line pairs that can be clearly seen in the output image within a width of 1 cm. The number of line pairs measured in this way is called the resolution of the image. At present, the resolution of the X-ray image intensifier can reach 25 to 50 line pairs/cm or more.
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