低管电压CT血管成像对颈动脉斑块的临床应用价值

目的探讨80k V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(80k V)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)m Gy、(295.04±43.93)m Gy.cm、(1.74±0.26)m Sv;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(K0.60,P0.05)。结论采用80k V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。

The Clinical Value of Carotid CT Angiography with Low Tube Voltage in Carotid Atherosclerotic Plaques

[Abstrat]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.