The field of view of the triple-field image intensifier is the maximum output image size displayed on the output screen when the X-ray irradiation is parallel to the axis of the triple-field image intensifier at a specified electrode voltage. There are five, six, seven, nine, and twelve inches of fixed field enhancers, and 11 inches, seven, nine, five, four inches, six inches, and fourteen inches of variable field enhancers. All of these are nominal horizons. Because the tube emits point rays, and the object can neither be infinitely far from the tube, nor can it be close to the triple-field image intensifier input screen, the effective field of vision is always smaller than the nominal field of vision. For example, the effective input field of 9 inches is about 8 inches, and the effective field of 6 inches is about 5 inches. (1 inches = 2.54cm)
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