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目的:探讨幅度对比法磁共振血管造影(magnitude contrast magnetic resonance angiography,MC MRA)、二维时间飞跃法磁共振血管造影(2D time of flight magnetic resonance angiography,2D TOFMRA)、滑动间隔Ky(Sliding interleaved KY,SLINKY)采集的三维时间飞跃法磁共振血管造影(3D time of flight magnetic resonance angiography,