デジタル入力信号収集法の相違による乳房画像の比較

概要

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Digitized images were obtained in two ways: one using laser scanning of a conventional mammographic film/screen system(referred to here as transmittance DR(digital radiography)), and the other using laser scanning of a photostimulable luminescence phosphor surface(referred to as an Imaging Plate(IP)), which creates light signals to be turned into electrical signals for digitalization(called reflection DR). Based on clinical cases and several phantom studies, digital images obtained in the above two ways were visually compared with each other. The reflection DR produced blurred images of small dot-like objects, casing them to appear much larger than their actual size. Therefore, even with the same aperture size(100-μm diameter), visibility was inferior to the reflection DR especially in cases involving minute calcifications. Additionally, there was a direct dependence on the visibility of linear and low contrast objects. The reflection DR did not make the best of its feature of rather of small aperture size, which may result during the stage in which light signals are acquired from the IP.
公益社団法人日本放射線技術学会の論文