Application of Radiographic Magnification Technique with an Ultra-High-Speed Rare-Earth Screen/Film System to Oral Cholecystography

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Abstract
Double magnification employing a 200-.mu. focal spot and an Alpha 8-XM screen/film system was applied to oral cholecystography and the results compared with those for the conventional contact technique with the Par-RP system. The image quality obtained with magnification was comparable to or better than that for the conventional technique. In clinical studies on the detection of gallstones, the conventional technique revealed 5 true-positive and 17 true-negative cases and 1 false-positive and 2 false-negative cases, while the magnification technique provided 7 true-positive and 18 true-negative cases but no false cases. With the magnification technique the skin dose was reduced to approximately half that for the conventional contact technique.

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