目的探讨双源CT动态管电流 调节技术补偿低电压扫描在下肢CTA降 低辐射剂量的价值；方法 回顾性的分 析双源CT下肢CTA患者64例，根据不同 的扫描条件分常规组和实验组各32例， 应用统计学软件分析两组病例图像质 量、CTDIvol、DLP、ED、SNR、CNR是否 有统计学意义；结果 两组病例图像质 量、CTDIvol、DLP、ED、SNR、CNR常规 组分别为：2.75±0.44、4.30±0.21、 483.53±35.73、8.10±0.54、 27.43±4.81、23.38±4.61；实验组 分别为：2.72±0.46、2.15±0.11、 237.09±13.88、3.56±0.21、 28.34±4.96、24.14±4.76。两组图像评 分、SNR、CNR均无统计学意义(P>0.05)； CTDI vol、DLP、ED均有的统计学意义 (P<0.01)，实验组小于常规组约50％；结 论 双源CT动态管电流调节技术管电流补 偿低电压扫描在下肢CTA中降低辐射剂量 效果明显，是一个值得推广的方法。

Objective To investigate the dual-source CT Lower Extremities CTA using tube current auto Compensatory Low voltage scan to reduce radiation dose. Methods A retrospective analysis of 64 cases of dual-source CT Lower Extremities CTA imaging data. According to the different points of the scanning conditions we divided routine group and experimental group 32 cases each. We applied statistical software to analysis two groups of cases the image quality,CTDIvol, DLP, ED, NR, CNR whether statistical significance. Results The routine group respectively:2.75±0.44、4.30±0.21、483.53±35.73、 8.10±0.54、27.43±4.81、23.38±4.61;The experimental group respectively: 2.72±0.46、2.15±0.11、237.09±13.88、3.56±0.21、28.34±4.96、24.14±4.76; Two sets of image quality, SNR, CNR had no statistical significance (P＞0.05); Differences between the two groups CTDIvol, DLP, ED values are statistically significant (P＜0.01), the experimental group were decreased by approximately 50% compared to the routine group. Conclusion The Dual-source CT Lower Extremities CTA using tube current auto Compensatory Low voltage scan to reduce radiation dose effect is obvious.It is a good method worthy of popularizing.