A filmkcreen system is described where the light emission of the intensifying screen is in the ultraviolet (w), which is more efficiently absorbed by lhe film, and hence print-through is vinualiy eliminated. In addition, because of significantly higher uv absorption within the screen, the modulation lransfer function (Mm) is superior to that of conventional systems based on visible light. Thus the overall uv fildscreen system has superior imaging efficiency and quality, as measured by the detective quantum efficiency (WE) and the noise equivalent quantum efficiency (NEQ)), to those of conventional systems, These imaging chancteristics of the novel systems are described here and are compared with those of some conventional systems,
A 6X-speed system based on Ultra-Wsion technology has been designed. Since the undoped yttriwn taiztalate phosphor used in other Ultra-Wsion' screens is incapable of achieving the required speed with existing films it was necessary to admix a smallfraction of lanthanum oxybromide which is a more efficient x-ray to light converter and which emits both visible (470 ivn) and LW (370 nm) light. The image quality peifonnance ofthe resulting system approaches that of conventional 4Xi-speed film/screen systems. These image quality characteristics are described and compared with those ofconventional 6X-speed and 4W-speed systems.
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