オルソパントモグラフにおける断層像と障害像について

概要

論文の詳細を見る
The redundant shadows produced on the orthopantomographs were evaluated in an attempt to obtain the good quality for the clinical diagnostic use. On orthopantomographs, two different types of images, primary and secondary, are recorded because of a rotating tomographic system with a narrow beam which passes twice through the retromolar region of the mandible. Two different orthopantomographic machines were surveyed on this study. By using noticeable screws and mesh plate phantom set on the trace of rotational center and image layer, the primary and secondary shadows were examined with the second slit 1 mm width on each machine. From the observation of the shape and the number of the shadow produced, they were divided into six patterns, and six areas were detected in accordance with each pattern. The size of these areas was various in each machine, and it was found that wide locus of rotational center reduces such secondary shadows.
公益社団法人日本放射線技術学会の論文
1977-03-01