多层螺旋CT在肋间后动脉显示中的价值

Demonstration of the posterior intercostal artery with multislice helical CT

目的评价多层螺旋CT(MSCT)对肋间后动脉显示的价值。方法回顾性分析26例胸部正常者的16层螺旋CT增强扫描图像,结合横断面及最大密度投影(MIP)、容积再现(VR)重组图像,测量观察各支肋间后动脉的起点及走行规律。结果肋间后动脉总显示率为93.38%(437/468支),左、右两侧显示率分别为92.31%(216/234支)和94.44%(221/234支)。77.31%(167/216支)左侧肋间后动脉起于胸主动脉后壁,右侧肋间后动脉起点分别位于胸主动脉后壁、右后壁和右壁,且自上而下渐由右壁向后壁移行。各肋间后动脉起点处内径自上而下略有增粗(0.162～0.208cm),左右两侧差异无统计学意义(P>0.05)。肋间后动脉进入肋沟处与棘突连线及同侧横突的平均垂直距离分别为(7.43±1.18)cm和(4.41±1.15)cm。结论应用MSCT增强扫描可以清晰显示肋间后动脉的起始及走行等解剖结构。

Objective To assess the ability of contrast-enhanced multislice helical computed tomography（MSCT） to depict the posterior intercostal artery （PICA）. Methods Images of twenty-six patients without thoracic disease underwent contrast-enhanced MSCT of chest were retrospectively analyzed. MIP and VR were used to reconstruct PICA and were investigated with transverse images to display the anatomy of the artery by two experienced doctors. Results Four hundred and thirty-seven of 468（93.38% ） PICA were shown by using contrast-enhanced MSCT. Most of the left side of PICA（77.31% ） derived from the posterior wall of the aorta, while the origin of the right side of PICA shifted from the right wall to posterior wall from up to down. Fifty percent of right bronchial arteries co-originated with right PICA. There was no significant difference in the inner diameter of the two side of PICA. The average distances from the spinous and transverse processes to the point where PICA begin to be protected by the rib were （7.43 ± 1.18 ）cm and （4.41±1.15 ）cm respectively. Conclusion The anatomy of PICA can be shown clearly with contrastenhanced MSCT.