| ZENG Yong-ming,WU Fu-rong,ZHANG Zhi-wei.Amorphous selenium flat-panel detector digital radiography versus computed radiography:phantom study of depiction of simulated lesion and dose reduction[J].Chinese Journal of Radiological Medicine and Protection,2008,28(3):294-296 |
| Amorphous selenium flat-panel detector digital radiography versus computed radiography:phantom study of depiction of simulated lesion and dose reduction |
| Received:June 04, 2007 |
| DOI： |
| KeyWords:Digital Radiography Simulated Lesion Chest Phantom Radiation Dose |
| FundProject: |
| Author Name | Affiliation | E-mail | | ZENG Yong-ming | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | WU Fu-rong | 重庆市疾病预防与控制中心 | | | ZHANG Zhi-wei | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | | | 欧阳羽 | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | 1957ouyanyu@sina.com | | 谭秀洪 | 重庆市疾病预防与控制中心 | | | 金瑞 | Department of Radiology, First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China | |
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| Abstract:: |
| Objective To compare an amorphous selenium flat-panel detector digital radiography(DR) with a computed radiography(CR) for the depiction of simulated pulmonary lesion,as well as for evaluation of dose reduction. Methods Simulated linear,reticular,and nodular lesion were located in an anthropomorphic chest phantom.The phantom was exposed by DR and CR with different mAs sets.The entrance surface doses were recorded for all images.Hard copy images were generated at different dose levels.Images were presented in a random order to four independent radiologists.They subjectively rated the visibility of simulated pulmonary lesion.Statistical significance of difference was analysed with wilcoxon test. Results The visibility of simulated linear and reticular lesions on the images obtained with DR was superior to the images from CR at 2.0 and 3.2 mAs,P<0.05(Simulated linear lesion:Z=-2.032,P=0.042;Z=-2.375, P=0.018. Simulated reticular lesion: Z=-2.680, P=0.007;Z=-2.670, P=0.008).However,there was no statistically significant difference between DR and CR at 5.0 and 6.3 mAs(P＞0.05).DR was superior to CR in detection small nodular(diameter<10 mm) lesions at different dose level(mAs:2.0,3.2,5.0,6.3),P<0.05(Z=-2.237, P=0.018; Z=-2.384, P=0.017; Z=-2.388, P=0.017; Z=-2.366, P=0.018).When the visibility of simulated pulmonary lesion for DR and CR were equal,The radiation dose was reduce approximately 65% with the DR. Conclusions DR was superior to CR in depiction of tiny lesion and dose reduction greatly. |
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