Abstract
Summary The zoom image amplifier developed in 1969, has an effective viewing field variable from 5 inches to 11 inches continuously. Various attempts were made to apply this equipment to clinical use and satisfactory results were obtained in telefluoroscopy, 70 mm. fluorography and cinefluorography. The features of the zoom image amplifier are as follows. 1 The optimum field size for the diagnosis can be selected. 2 Zooming increases resolution. 3 Fine lesions are enlarged and easy to follow. 4 Since the eye is more sensitive to moving objects than static ones, zooming in makes detail easier to detect. In this paper, a technical explanation and clinical application of the zoom image amplifier were given.
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