[Cerebral angiography using proton spin tomography]. 
In only a few years magnetic resonance angiography has evolved to a clinically useful tool.  In many situations it can resolve questions which used to be addressed by conventional contrast angiography, such as carotid stenoses, aneurysms, arteriovenous malformations, and venous and sinus disorders.  In addition, selective magnetic resonance angiography provides information on direction and origin of flow and circulation in vessels serving as collaterals.