Non-contrast intracranial magnetic resonance angiography is a type of brain magnetic resonance that focuses on intracranial blood vessels rather than other tissues in the brain. Magnetic resonance angiography allows for images of blood vessels and blood flow with quality comparable to conventional angiography but is a non-invasive procedure to the blood vessels to evaluate the condition of stenosis, blockage of cerebral vessels, cerebral aneurysms and other pathologies.