摘要: In the first year of grant period, we have completed the following tasks; (1) wehave improved the spatial resolution capability of our storage phosphor image reader by using a high resolution phosphor and by reducing the laser spo... 展开 In the first year of grant period, we have completed the following tasks; (1) wehave improved the spatial resolution capability of our storage phosphor image reader by using a high resolution phosphor and by reducing the laser spot size from 120 micrometers to 50 micrometers. (2) we have compared the spatial resolution capability of the improved system with those of the unmodified system and a Min-R screen-film combination. (3) We have investigated the method of constructing phantoms for the comparison study. (4) We have developed and tested compression algorithms for mammographic images. The completion of the above mentioned tasks has resulted in an improved storage phosphor imaging system for mammographic applications. we have demonstrated with phantom images that the quality of the storage phosphor images, obtained with the improved imaging system, is comparable to that of the screen-film images acquired with a clinical mammographic unit at our institution. With the completion of the above tasks, we are largely prepared to start acquiring phantom images for the ROC studies. Digital radiography, Mammography, Breast imaging, Computed radiography, Storage phosphor, Breast cancer, RAD VI. 收起