64排螺旋CT 80 kV双期扫描在下肢动脉CT血管成像中的临床应用

Clinical application of 64 dual-phase helical CT scan at 80 kV for angiography of lower extremities

目的:探讨80 k V双期扫描模式在下肢动脉CT血管成像(CT angiography,CTA)检查中的临床应用价值。方法:60名怀疑下肢动脉硬化闭塞症的患者随机分成A、B两组,A组(30例)接受120 k V下肢动脉CTA常规单期扫描模式检查,B组(30例)接受80 k V双期优化扫描模式检查,比较两组动脉阻塞程度、各节段动脉CT值和患者所受的辐射剂量。结果:动脉阻塞程度评分在两组之间没有统计学意义(P=0.11),B组总体和各动脉节段CT值明显高于A组(P<0.05),两组CT值最大的部位出现在腘动脉,CT值最小的部位出现在小腿动脉。B组患者所受分辐射剂量明显低于A组(P<0.001)。结论:64排螺旋CT 80 k V下肢动脉双期扫描不仅能明显减低患者辐射剂量,而且可以提高图像质量。

Objective：To assess the clinical value of dual-energy computed tomography angiography（CTA）at tube voltage 80 k V for examination of the lower extremities.Methods：Sixty suspected patients with arteriosclerosis occlusive disorders in the lower extremities were randomized into group A and group B（n = 30 for each）.Single-acquisition CTA was performed at routine voltage 120 k V for group A,whereas dual-phase CTA was carried out at 80 k V for group B.The two groups were compared regarding the distribution of segmental patency,arterial CT values,and radiation dose.Results：The two groups had no statistical differences concerning the distribution of segmental patency（P = 0.11）,yet higher arterial CT values was seen in group B（P 〈 0.05）.Maximal CT values occurred in the popliteal artery,and lowest values in the calf arteries was the lowest.The radiation dose in group B was significant lower than that of group A（P 〈 0.001）.Conclusion：Dual-phase multi-detector（64-rows）CTA for lower extremities at tube voltage 80 k V can not only reduce the radiation dose,but improve the imaging quality.