Higashida Y, Hatemura M, Yoshida A, Takada T, Takahashi M
Department of Radiological Technology, Kumamoto University College of Medical Science.
Nihon Igaku Hoshasen Gakkai Zasshi. 1998 Aug;58(9):473-8.
Our aim in this study was to evaluate the potential utility of magnification mammography with a CR system by investigating the basic imaging parameters and detectability of microcalcifications in comparison with those of conventional screen-film systems. The basic imaging parameters were evaluated by measuring scatter fraction, modulation transfer function (MTF), Wiener spectrum, and incident dose for the various magnification factors. The detection of simulated microcalcifications in radiographs of a mammographic phantom and breast specimens were evaluated subjectively and quantitatively for screen-film and CR techniques with various magnification factors. The scatter fraction of digital magnification mammography decreased with increasing magnification factor. MTF of magnification digital mammography improved with increasing magnification factor. The detectability of microcalcifications with the CR system was significantly improved by magnification technique. From the above results, it is expected that the use of magnification mammography with a CR system will improve the detectability of microcalcification.
本研究的目的是通过研究基本成像参数以及与传统屏-片系统相比微钙化的可检测性，来评估使用计算机X线摄影（CR）系统进行放大乳腺摄影的潜在效用。通过测量不同放大倍数下的散射分数、调制传递函数（MTF）、维纳频谱和入射剂量来评估基本成像参数。对不同放大倍数下使用屏-片和CR技术的乳腺摄影模体和乳腺标本的X线片中模拟微钙化的检测进行主观和定量评估。数字放大乳腺摄影的散射分数随放大倍数增加而降低。放大数字乳腺摄影的MTF随放大倍数增加而改善。CR系统通过放大技术显著提高了微钙化的可检测性。根据上述结果，预计使用CR系统进行放大乳腺摄影将提高微钙化的可检测性。
