计算机辅助三维CT重建椎动脉横突段的走行及解剖变异

背景:目前不同影像学方法对椎动脉的检查仍然存在差异和争论,计算机断层扫描血管造影技术的发展,为血管及骨关节结构的解剖观察及疾病诊断提供了新的手段。目的:评价三维CT血管造影显示椎动脉横突段的效果,明确其走行及变异。方法:从2009-12-01/2010-05-31头颈部联合CT血管造影检查的三维影像资料中,去除椎动脉不显影或显影不清楚的资料,选出无明显异常病变者250例,在三维图像上观察椎动脉在横突段的走行及血管管径的变异。获得原始断层图像后,通过容积重建、多层面重建、表面遮盖成像来显示椎动脉。结果与结论:椎动脉经C6横突孔进入占所有样本的92.6%,经异常横突孔进入占所有样本的7.4%(37条),经C4,C5,C7横突孔进入的发生率分别为2.2%(n=11,占不正常的29.7%),4.6%(n=23,占不正常的62.2%),0.6%(n=3,占不正常的8.1%)。20例为右侧异常(54.1%),17例为左侧异常(45.9%)。所有患者中27例为单侧异常(10.8%),5例为双侧异常(2%)。比较椎动脉管腔直径,左侧直径明显大于右侧53例,右侧直径明显大于左侧30例,左右侧差异具有显著性意义(P<0.01)。提示椎动脉在横突段的解剖变异发生率较高,三维CT血管造影能客观地反映椎动脉的病理改变,并清晰显示椎动脉与骨性结构的关系。

Computer-assisted three-dimensional CT angiography for reconstruction of course and variations of the second segment of vertebral artery

BACKGROUND:Different imaging detections for vertebral artery are still varied and controversial.The development of CT angiography has provided a new method for the anatomic observation and disease diagnosis about vessels and joints.OBJECTIVE:To evaluate the three-dimensional CT angiography (3DCTA) in displaying the second (V2) segment of the vertebral artery,and to identify its course and variation.METHODS:Totally 250 cases without obvious pathological lesions were selected from the 3D data of head-neck CT ...