著者

畑川 政勝 井上 誠 庄垣 雅史 岸本 健治 吉田 梨影

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.48, no.11, pp.1932-1938, 1992-11-01

被引用文献数

13

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The modulation transfer function (MTF) has been used for evaluation of radiographic image quality. However, in digital radiographic system such as a computed radiography (CR), the MTF can not be used in the same way of an analog system for evaluation because digital system is not shift-invaliant system. Then, we suggest the "MTF_<final>" which includes geometric unsharpness, detector unsharpness, unsharpness of the sampling aperture and unsharpness of the display (Laser-printer). It is an analog component in the digital system and in agreement with the definition of the MTF. Furthermore, an overall aliasing has to be used with MTF_<final> for evaluating the digital system because it is one of the important factors of the digital system. The MTF_<final> and the overall aliasing can be obtained from the overall MTFs of the center alignment and the shifted alignment.