It is thought that noise prQperty and the shape of H − D curve of AD system (HGM / URI)are more suited for chest radiographs compared with conveDtional system (HR4 ! super HRS), Therefore , we studied the visua [ detectability of low contrast simulated nodules usillg chest radiographs taken by AD and HR4 / super HRS systerrls 、 Film base 、vas used as a simulated nodule . Fifty . sixradiographs , w 託h and without a nodule each , were empbyed for obserber performance test . Receiver operating characteristic analysis (the method for cor 】 tinuously ・ distributed test results)was used fol − observe 【 ' perfornlance data. As a result 、 the 亡 otal detectability of AD system was sligthly superior to that of HR4 / s 叩 er HRS system . In the niediastinurn area , however , AD system was greatly superior compared to HR4 / super HRS system , and h the lung 丘eld both were alrnost equal . L は じ め に
Anew concept found successful for improving the image quality of computed radiography ( CR ) is presented , It is shown theoretically and experimentally that radiographic contrast and sharpness can be improved by reduction
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