64层螺旋CT头、颈部动脉扫描技术的应用

Study of 64-slice Spiral CT Techniques in Cerebral and Carotid CT Arteriography

目的:通过对比两组不同螺距及球管旋转时间对64层螺旋CT头、颈部动脉血管联合扫描的影响,以获得合理的扫描参数。方法:随机选择临床疑有头颈部血管病变患者40例,随机分成A组(球管旋转时间0.5s/r,螺距1.0)、B组(球管选旋转时间0.75s/r,螺距0.8),其他扫描参数不变,根据颈动脉、颈静脉远、中、近各段CT强化值,综合对比不同扫描参数对成像的影响。结果:40例患者图像均能重建并进行诊断,对头、颈部动脉的显示,A组较B组更能有效避免静脉显影的干扰。结论:利用64层螺旋CT头、颈部动脉血管联合扫描,选择合理的扫描参数,可在动脉期内完成扫描,有效减少静脉成像对动脉成像的干扰,获得较为单纯的动脉期图像。

Objective：Comparison of two CT arteriography scanning techniques with 64 slice spiral CT, using different values of pitch and rotation time to demonstrate the influence on image quality images obtained, in order to obtain the reasonable scanning parameters. Methods：40 cases with suspected cerebral and/or carotid artery diseases were divided into two groups at random：Group A with rotation time 0.5s/circle,pitch 1.0 and group B with rotation time 0.75s/circle, pitch 0.8 No difference was made in other scanning parameters. According to the CT values of distal, middle, proximal segments of carotid artery and jugular vein after contrast enhancement, the influence on image quality with different scanning parameters were compared comprehensively. Results：Of the 2 groups with different parameters in CT arteriography, reconstruction of cerebral and carotid artery images could be finished and diagnosis could be obtained. Yet, there was less interference by images of vein displayed in group A. Conclusion： When using 64-slice spiral CT in cerebral and carotid CT arteriography, more simple and unitary arterial images could be obtained by choosing reasonable scanning parameters, with less interference by images of vein displayed and the whole process could be finished in arterial phase.