| Fu Qing,Yu Jianming*,Kong Xiangchuang,Liu Yonghua,Lei Ziqiao,Han Ping,Kong Xiangquan,Mei Hao.The feasibility study of 80 kV in 128-slice MSCT pulmonary angiography[J].Chinese Journal of Radiological Medicine and Protection,2014,34(1):62-66 |
| The feasibility study of 80 kV in 128-slice MSCT pulmonary angiography |
| Received:May 31, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.01.017 |
| KeyWords:CT pulmonary angiography Radiation dose Tube voltage Tomography |
| FundProject: |
| Author Name | Affiliation | E-mail | | Fu Qing | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Yu Jianming* | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | yujianming3210@sohu.com | | Kong Xiangchuang | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Liu Yonghua | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Lei Ziqiao | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Han Ping | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Kong Xiangquan | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | | | Mei Hao | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China | |
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| Abstract:: |
| Objective To investigate the influence of 80 kV on dose reduction and image quality in 128-slice CT pulmonary angiography (CTPA) compared with the conventional 120 kV. Methods Sixty patients suspected of pulmonary embolism (PE) who underwent CTPA were randomly divided into 80 kV and 120 kV groups by random digits table method. All the patients underwent CTPA with automatic tube current modulation. The values of volume CT dose index (CTDIvol), dose length product (DLP) were recorded and effective dose (E) was calculated. The attenuation was measured in central and peripheral pulmonary arteries as well as background noise (BN), then signal-to-noise-ratio (SNR) and contrast-to-noise-ratio (CNR) were calculated. The radiation exposure, pulmonary arterial enhancement, background noise, SNR, CNR and scores of image quality by a 5-point scale were compared between two groups. Results E value was significantly lower at 80 kV [(0.99±0.27)mSv] compared with 120 kV [(3.02±0.87) mSv, t=12.281, P<0.05].The mean attenuation value of pulmonary arteries as well as BN in 80 kV group were significantly higher than in 120 kV group (P<0.05). SNR and CNR did not differ significantly between two groups. No significant difference was detected on scores of image quality(P>0.05). Conclusions The application of 80 kV protocol combined with automatic tube current modulation scanning in 128-slice MSCT pulmonary angiography could significantly reduce radiation dose compared with the conventional 120 kV protocol without deterioration in diagnostic image quality. |
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