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  • Title: Clinical comparison of high-speed rare-earth screen and par-speed screen for diagnostic efficacy and radiation dosage.
    Author: Robinson T, Becker JA, Olson AP.
    Journal: Radiology; 1982 Oct; 145(1):214-6. PubMed ID: 6821592.
    Abstract:
    One hundred patients underwent excretory urography and a comparison was made of ten-minute, well-collimated images that were obtained with both par-speed and rare-earth screens, the latter being 6.5 times faster than the par-speed calcium tungstate screens. Radiation dose was greatly reduced with the rare-earth screens. There were fewer inferior examinations, even though fine detail was imaged poorly, and there was a slightly increased quantum mottle, which was only a minor problem at this low 65 kVp. Since quantum mottle increases with kVp, however, our results are not applicable to higher kVp examinations. Despite reduced detail and increased mottle, the overall image quality obtained with the rare-earth screen was superior to the image quality obtained with the par-speed screen.
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