后交通动脉的MRI与生物塑化薄层断面解剖学研究

A Study on Anatomy of the Posterior Communicating Artery with MRI and Secional Plastination

目的 :探讨后交通动脉的正常表现及变异。材料和方法 :以MR成像和生物塑化切片技术完成 14 0例正常人FLASH 3D和TOF MRA横断位成像及 9例标本的生物塑化薄层切片 ,以塑化切片、源图像及MPR、MIP图像观察后交通动脉的走行、形态及其与动眼神经的关系。结果 :生物塑化薄片示后交通动脉为节段显示 ,MRI与之有良好的对应关系 ,后交通动脉显示率为 6 3 .9% ,胚胎型后交通动脉显示率 8.9% ,其中 10侧与动眼神经接触 ,而且胚胎型后交通动脉的存在形式与大脑后动脉的显示有明显的关系。结论 :MRI不仅能够显示后交通动脉的走行、形态 ,而且能够明确与神经的关系 ,是评价后交通动脉的较为准确的检查技术。

Purpose: To study the normal manifestation and the variation of the posterior communicating artery (PCoA) with MRI and plastination. Materials and Methods: A total of 140 normal individuals were imaged with FLASH 3D and TOF MRA, and the plastination slices of the brain stem were made in 9 individuals. The position, morphology of PCoA, and its relationship with the oculomotor nerve were observed from the plastination slices, and from the original images and MPR and MIP images. Results: Sectional plastination clearly showed the segmental structure of PCoA, and MRI revealed the similar result corresponding to the plastination section. 63.9% of PCoA were showed on MR images, 8.9% of them were the embryonic type, and 10 sides of them were in contact with the oculomotor nerve. Additionally, the existing state of PCoA was significantly associated with that of the posterior cerebral artery. Conclusion: MRI is the reliable method for demonstrating PCoA because it can not only show the position and morphology of the artery but also reveal the relation to the oculomotor nerve.