骨シンチグラフィ全身プラナー像におけるTop-hat変換処理の有用性に関する検討

摘要

骨シンチグラフィ（骨シンチ）は核医学検査の中で最も多く施行されている検査の一つである．全身プラナ像（全身像）の異常集積部位に対し，Static撮像あるいはsingle photon emission computed tomography（SPECT）の追加撮像を行うことで，その診断精度が大幅に向上する場合がある．そのため，多くの施設でこのような方法がルーチン検査として実施されている．%To assess the usefulness of top-hat transform processing in whole body bone scintigraphy, five radiological technicians interpreted both original and top-hat processed images to determine the improvement of lesion detectability and interpretation time. For the evaluation of detectability, receiver operating characteristic (ROC) analysis was performed. The area under the curve (AUC) calculated from the ROC curve was improved in all observers (from 0.786 to 0.864 in average), although no significant difference was observed. However, the interpretation time was improved significantly (from 24.5 to 16.2 s in average). Top-hat transform processing in whole body bone scintigraphy is thought to be useful for the improvement of lesion detectability and interpretation time.