| GUO Ying,GE Ying-hui,SHI Da-peng,GUO Ying,NING Pei-gang,WEN Ze-ying,ZHANG Shou-hua.Feasibility study of automatic tube current modulation technique of 64-slices CT for reducing radiation doses of lower extremity arterial imaging[J].Chinese Journal of Radiological Medicine and Protection,2009,29(6):624-626,642 |
| Feasibility study of automatic tube current modulation technique of 64-slices CT for reducing radiation doses of lower extremity arterial imaging |
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| DOI：10.3760/cma.j.issn.0254-5098.2009.06.023 |
| KeyWords:Lower extremity,angiography Radiation dose Image noise Tomography X-ray computed |
| FundProject:河南省医学科技攻关计划项目(200702012) |
| Author Name | Affiliation | E-mail | | GUO Ying | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | | | GE Ying-hui | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | cjr.geyinghui@vip.163.com | | SHI Da-peng | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | | | GUO Ying | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | | | NING Pei-gang | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | | | WEN Ze-ying | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | | | ZHANG Shou-hua | Department of Radiology, Henan Provincial People's Hospital, Zhengzhou 450003, China | |
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| Abstract:: |
| Objective To investigate the value of automatic tube current modulation technique of 64-slices CT for reducing radiation doses of lower extremity arterial imaging. Methods Adjustment tube current through the pre-test changes in the noise index (NI), obtained the image quality and radiation dose with better matches when NI value of 10 HU. Fifty-two diabetic and hypertensive patients suspicious of having lower extremity occlusive disease underwent 64-slices CT volume scan arranged from infra-renal aorta to feet and separated random into 2 groups. The experimental group of 26 patients(FM) used fixed tube current of 300 mA technique, and the the follow-up of 26 patients(control group) used automatic tube current modulation (ATCM) technique with NI＝10. We selected the observing levels at infra-renal aorta,femoral artery of hip joint level, popliteal artery and anterior tibial artery at ankle level. Both sets of image quality, image noise and radiation dose were analyzed by using t -test. Results The radiation dose level of ATCM group[CTDIvol:10.81 mGy,DLP:(1280.40±124.70) mGy·cm] was lower than FM group[CTDIvol:(5.14±1.23) mGy,DLP: (582.86±150.41) mGy·cm] by 54.4%,difference between the two groups was statistically significant( t CTDIvol=13.13, t DLP=17.36, P <0.05).The difference of image noise in four levels between ATCM group[10.76±2.11、12.13±2.96、10.47±2.96、(6.17±1.53) HU] and FM group[13.80±4.04、14.53±2.79、5.69±1.38、(4.75±1.38) HU] was significant ( t =2.991,3.038,7.287,3.186, P <0.05).The image noise of ATCM group were lower than FM group at infra-renal aorta level and femoral artery of hip joint level,but ATCM group were higher than FM group at popliteal artery level and anterior tibial artery at ankle level. The variations of noise were reduced with the ATCM technique with more uniform image quality. There was no significant difference in image quality score between the ATCM group(2.462±0.582) and FM group(2.654±0.562)( t =1.21, P >0.05). Conclusion Lower extremity CT scanning with automatic tube current modulation technique (NI=10) can greatly reduce the radiation exposure by 54.4% and maintain the equivalent image quality. |
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