3D-CTA not only demonstrated the site size and 3D contour of the tumors but also clearly displayed the 3D spatial relationship of the tumors main vessels of Willis ' circle nearby venous sinuses and the bone of the skull base .

3DCTA特别清晰地显示了肿瘤、 Willis 环的大血管、静脉窦和颅底骨相互之间的三维空间关系。

Results : MRA accurately demonstrated the collateral flow of Willis ' circle .

结果：MRA准确显示了 Willis 环及其 邻近主要 脑 动脉 的 血管 开放 状态与侧支代偿血流及其 方向。

Practical Anatomy of Willis ' Circle : A Comparison with DSA Manifestations

脑 底 动脉 环应用解剖与DSA对照分析

Objective : To evaluate TOF MRA in assessing the anatomy and functions of Willis ' circle by comparing with conventional angiography ( CA ) .

目的：对比分析 Willis动脉 环的MRA和CA表现，探讨TOF法MRA评价 Willis 环解剖与功能的价值。

MRA Study of the Morphology of Willis ' Circle in Healthy Chinese

正常国人 Willis 环形态的MRA研究

Objective To observe the morphology and patterns of Willis ' circle in healthy Chinese by using multiple MRA sequences and / or 3D FSPGR .

目的联合运用多种MRA序列和/或3DfSPGR序列观察正常国人的 Willis 环形态及其类型。

Conclusion To classify the patterns of Willis ' circle of normal Chinese with MRA can provide useful information for the related studies .

结论利用MRA对正常国人 Willis 环形态进行分型，可为今后有关研究提供依据。

Microsurgical anatomy of the posterior portion of willis ' circle and the posterior cerebral artery

Willis 环后部与大脑后动脉的显微外科解剖学