目的 探讨80kV低管电压多层螺 旋CT血管成像(CTA)对颈动脉斑块的临床 应用价值。方法 对56例患者在一周内行 颈动脉低管电压(80kV)CTA和彩色多普勒 血流显像(CDFI)检查。记录MSCTA中每例 患者的容积CT剂量指数(CTDIvol)、剂量 长度乘积(DLP)，计算出有效剂量(ED)， 并记录颈总动脉、分叉处、颈内动脉CT 值，算出均值；分析比较两种检查方法 对颈动脉斑块的检出率、斑块性质及狭 窄程度的差异。结果 CTA的CTDIvol、 DLP、ED分别为(11.82±0.00)mGy、 (295.04±43.93)mGy.cm、(1.74±0.26) mSv；颈动脉CT均值为(489.71±46.74) HU；低管电压CTA及CDFI对颈动脉斑块 的检出、斑块性质判定、狭窄程度的判 定结果差异无统计学意义(K＞0.60，P <0.05)。结论 采用80kV低管电压行颈部 CTA检查，受检者的辐射剂量明显降低， 且对颈动脉斑块的诊断不受影响，是一种 行之有效的低剂量扫描方法。

Objetive To investigate the clinical value of carotid computed tomography angiography(CTA) with 80kV lower tube voltage in carotid atherosclerotic plaques. Methods 56 patients underwent examinations of carotid artery with both CTA with 80kV lower tube voltage and color Doppler flow imaging(CDFI) within 7 days. CT dose volume index(CTDIvoI) and dose length product(DLP) was recorded to calculate the effective dose(ED). CT values of carotid artery of every patient were recorded. Compared and evaluated the concordance between 80kV low tube voltage CTA and CDFI in detecting carotid atherosclerotic plaques and assessment of stenosis. Results The mean values of CTDIvol,DLP and ED were (11.82±0.00)mGy,(295.04±43.93)mGy. cm and (1.74±0.26)mSv.The mean attenuation was (489.71±46.74)HU. There was no statistically significant (K＞0.60,P<0.05)between low tube voltage CTA and CDFI in detecting carotid atherosclerotic plaques and assessment of stenosis. Conclusion With 80kV lower tube voltage in carotid CTA, the radiation dose can be markedly reduced,and it is of great value in clinical application for the diagnosis of the carotid atherosclerotic plaque.