Objective To evaluate abilities of 3DTOF, 3DPC and 3D FSPGR sequences and their combination in detecting the components of the circle of Willis based on the results of DSA.

• 目的 以DSA结果为标准 ,比较 3DTOF、3DPC、3DFSPGR序列及联合运用时对Willis环各组成血管的显示能力。