Clinical comparison of high-speed rare-earth screen and par-speed screen for diagnostic efficacy and radiation dosage.

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Abstract
Patients (100) underwent excretory urography, and a comparison was made of 10 min, well-collimated images that were obtained with both parspeed 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 [kilovolt peak]. Since quantum mottle increases with kVp, these 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.