| YUAN Qing-hai,LIU Jian-hua,HAN Bing,YANG Zhe,GONG Ting-ting.Preliminary research of reducing radiation dose in aortic CT angiography with 80 kV tube kilovoltage[J].Chinese Journal of Radiological Medicine and Protection,2010,30(6):740-743 |
| Preliminary research of reducing radiation dose in aortic CT angiography with 80 kV tube kilovoltage |
| Received:June 10, 2010 |
| DOI： |
| KeyWords:Tomography X-ray computer Radiation dose Signal-noise-ratio Contrast-noise-ratio |
| FundProject: |
| Author Name | Affiliation | | YUAN Qing-hai | Radiology Department of the Second Hospital, Jilin University, Changchun 130041, China | | LIU Jian-hua | Radiology Department of the Second Hospital, Jilin University, Changchun 130041, China | | HAN Bing | Radiology Department of the Second Hospital, Jilin University, Changchun 130041, China | | YANG Zhe | Radiology Department of the Second Hospital, Jilin University, Changchun 130041, China | | GONG Ting-ting | Radiology Department of the Second Hospital, Jilin University, Changchun 130041, China |
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| Abstract:: |
| Objective To evaluate the feasibility of 80 kV tube kilovoltage in aortic artery CT angiography with 256-slice CT. Methods A total of 62 patients undergoing aortic artery CTA were enrolled into this study and divided into conventional tube kilovoltage (120 kV, n =31) and low tube kilovoltage (80 kV, n= 31). The signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), volume CT dose index (CTDIvol) and effective dose (E) were evaluated, respectively. Results The mean image SNR was (35.92±5.04) and (33.95±8.30) for conventional tube kilovoltage and low tube kilovoltage, respectively, with no significant difference (t =1.131, P= 0.263). The mean image CNR was (30.32±4.78) and (28.71±7.96) for conventional tube kilovoltage and low tube kilovoltage, respectively, with no significant difference (t =0.964, P= 0.339). The average effective dose (E) was (14.28±0.96)mSv and (9.72±0.81)mSv for conventional tube kilovoltage and low tube kilovoltage, respectively, with significant difference (t =20.12, P <0.001). Conclusions 80 kV tube kilovoltage aortic artery CTA can reduce radiation dose by 31.9%, and contrast dose 50%,and maintain image quality compared with 120 kV tube kilovoltage. |
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