著者

真田 茂 小林 健 高島 力 松井 武司

出版者

公益社団法人日本放射線技術学会

雑誌

日本放射線技術學會雜誌 (ISSN:03694305)

巻号頁・発行日

vol.55, no.1, pp.60-68, 1999-01-20

被引用文献数

6

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Current radiographs were compared with previous ones, and their anomalies were enhanced by the digital subtraction of both images. This procedure affords easy recognition of temporal changes. The image by which the first derivative filter limits the orientation of gradients was used in order for "lung markings" to be matched when making adjustments prior to the subtraction of the two images. Previous and current images were then matched using the sequential similarity detection algorithm (SSDA) method. With our method, Althougy artifacts due to disagreement of the costal shadow were generated, subtle opacities such as infiltrates, nodules, bands, linear shadows, and cardiomegaly were clearly enhanced on the subtraction image. This suggests improved accuracy when fadiologists diagnose a sepuential chest image using the subtraction image.