Sandra Laurine Issler

The image quality characteristics of a novel ultra-high-resolution film/screen system

A film/screen system is described where the light emission of the intensifying screen is in the ultraviolet (UV), which is more efficiently absorbed by the film, and hence print-through is virtually eliminated. In addition, because of significantly higher UV absorption within the screen, the modulation transfer function is superior to that of conventional systems based on visible light. Thus the overall UV film/screen system has superior imaging efficiency and quality, as measured by the detective quantum efficiency and the noise equivalent quantum efficiency to those of conventional systems. These imaging characteristics of the novel systems are described and are compared with those of some conventional systems.

Image-quality characteristics of a film-screen system for chest radiology based on ultravision technology

As reported in an earlier paper, the characteristics of a film/screen system for chest radiology based on Du Ponts Ultra-VisionTM technology were initially designed by means of a digital model of the radiation transfer process. This film/screen system has now been made and its image quality characteristics are described and compared with model predictions.

Image quality characteristics of a high-speed film-screen system based on Ultra-Vision technology

A 600-speed system based on Ultra-VisionTM technology has been designed. Since the undoped yttrium tantalate phosphore used in other Ultra-VisionTM screens is incapable of achieving the required speed with existing films it was necessary to admix a small fraction of lanthanum oxybromide which is a more efficient x-ray to light converter and which emits both visible (approximately 470 nm) and UV (approximately 370 nm) light. The image quality performance of the resulting system approaches that of conventional 400-speed film/screen systems. These image quality characteristics are described and compared with those of conventional 600-speed and 400-speed systems.