| ZHAO Yong-xia,QIN Wei-chang,LIU Chuan-ya.Optimization of exposure factor in full-field digital mammography[J].Chinese Journal of Radiological Medicine and Protection,2008,28(6):649-651 |
| Optimization of exposure factor in full-field digital mammography |
| Received:November 29, 2007 |
| DOI： |
| KeyWords:Full-field digital mammography Imaging quality Radiation dose |
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| Abstract:: |
| Objective To investigate and find out the optimization of exposure factors in full-field digital mammography.Methods The images of NA18-220 mammography phantom were taken at FFDM system with automatic exposure control and the exposure factors were recored. The phantom with FFDM system were exposed by varying mAs (24, 28, 32,36 and45mAs)with the same kV of AEC. The phantoms with FFDM system were exposed by varying kVs (22,23,25,27 and 31kV) with the same mAs of AEC. The exposure factors were recorded. The images on monitor with the best window width and window level were read by four independent radiologists. The image groups of specks,nylon fibers and masses were assessed by the four experienced readers according to the criteria of 1999 Mammography Quality Control Manual for American College of Radiology. Statistical analysis was performed using analysis of variance.Results The scorings of specks, nylon fibers and masses were not statistically significant(P>0.05) at the exposure factors between 29kV,40mAs and 29kV,32mAs. But their exposure doses were different.The imaging quality of the phantom was not significantly different (P>0.05) between 40mAs,29kV and 40mAs,27kV. But their exposure doses were different.Conclusions To ensure the imaging quality, the AEC of primitive set should be detected. |
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