本文探讨磁共振在血管成象方面的技术及其实现方法，磁共振血管成象（MRA）可以抑制人体的静止组织而仅仅表现血管信息，并介绍了这种技术的临床应用，背景知识，成象方法及脉冲序列等等。目前磁共振血管成象可分二类：一类称为渡越时间（TOF）方法，这种方法利用血液流入，流出成象平面对磁共振信号幅度的影响，另一类称为相位对比（PC）方法，这种方法利用流体的磁共振信号感应的相移，在我们自己生产的低场磁共振系统上，设计了专门的磁共振血管成象脉冲序列，可以分别得到人体动脉，静脉和动静脉血管图象，实验结果令人满意，最后讨论了实现MRA的有关困难。

Magnetic Resonance angiography (MRA) is introduced, which is a kind of technology of MRI applied in blood flow. MRA shows only the blood flow and suppresses the static tissue. Various aspects about this technology such as potential clinical application, background, methods and pluse sequences are presented. The techniques of MRA have been sorted into two classes. The first class is the time-of-flight methods which use the effets on NMR signal caused by blood flowing in or out of the imaging plane. The second class is the phase contrast methods which rely on motioninduced phase shifts in transverse spin magnetization. On the low-field MRI system (0.15T) made by ourself, a special pulse sequece has been designed and the arterial, veinal and arterial-veinal angiography can be obtained separatly,and the results are satisfatory. The present difficulties in MRA are also presented and discussed.