| WANG Peng-cheng,ZHAO Lei,ZHAI Xiao-juan,et al.Effect of kVp and mAs settings on patient exposure dose and the detecting sensitivity for low contrast blood vessel in digital subtraction angiography[J].Chinese Journal of Radiological Medicine and Protection,2007,27(4):400-402 |
| Effect of kVp and mAs settings on patient exposure dose and the detecting sensitivity for low contrast blood vessel in digital subtraction angiography |
| Received:July 10, 2006 |
| DOI： |
| KeyWords:Digital radiography Flat panel detector Exposure dose |
| FundProject: |
| Author Name | Affiliation | | WANG Peng-cheng | Department of Radiology,Taishan Medical College,Taian 271016,China | | ZHAO Lei | Department of Radiology,Taishan Medical College,Taian 271016,China | | ZHAI Xiao-juan | Department of Radiology,Taishan Medical College,Taian 271016,China | | 刘伟 | Department of Radiology,Taishan Medical College,Taian 271016,China | | 张桂芳 | 苏州大学放射医学与公共卫生学院 | | 李士骏 | 苏州大学放射医学与公共卫生学院 | | 黄永杰 | 苏州大学放射医学与公共卫生学院 |
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| Abstract:: |
| Objective To investigate the effectiveness of kVp, mAs on patient exposure dose and the detecting sensitivity for low contrast blood vessel in digital subtraction angiography. Methods A DSA phantom with 1.5 mm diameter vessels containing iodine at various concentrations was made. The air kerma 1.1 μGy/frame was kept at the entrance of I.I, with kVp changed to measure ESD and to determine the detectable threshold iodine concentration (DTIC) of the phantom on image displayer.X-ray tube voltage was kept at 70 kV, adjusted mAs and measured air kerma at entrance of I.I, ESD and DTIC. The effect dose was calculated with Monte Carlo simulation program PCXMC Ⅴ 1.5. Results As kVp varied from 50 to 100 kV,while the entrance air kerma of I.I was kept at 1.1 μGy/frame, the ESD and effect dose of patient varied linearly according to mAs. As mAs changed from 6.4 to 64 less than 70 kV, the DTIC decreased exponentially, while as the exposure exceed 40 mAs,the improvement of DTIC become modest. Conclusions Reduction of the X-ray tube voltage instead of increase of the exposure level would improve the DSA system performance. As the entrance air kerma of I.I exceed 2.5μGy/frame,increasing exposure may not improve the image quality. |
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