目的探讨磁共振成像（MRI）和磁共振动脉成像（MRA）对烟雾病的诊断价值。

Objective To investigate the value of MRI and magnetic resonance angiography(MRA) for moyamoya disease .

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磁共振动脉自旋标记灌注成像技术是通过对动脉血作磁标记作为内源性对比剂，对脑组织的血流灌注进行定量测量的磁共振成像技术。

Magnetic resonance perfusion imaging of arterial spin labeling is a technique to quantificationally measure the cerebral blood flow using the labeling arterial blood as a endogenous tracer.

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