Magnetic resonance angiography was applied to the study of blood flow dynamics in the circle of Willis in nine patients with cerebrovascular disease and two normal volunteers. In conjunction with two-dimensional or three-dimensional gradient-echo acquisitions, selective presaturation of individual vessels was used to determine the direction of blood flow and the origin of the vascular supply. P...

BACKGROUND AND PURPOSE Vertebral artery dissection causes endothelial changes and stenosis that may lead to recurrent ischemic neurological events. The diagnosis may not be obvious because the dissection may be painless and "spontaneous" (no obvious trauma). Magnetic resonance angiography has increasingly been used to screen patients for this disorder, but its accuracy has not yet been establis...

Background and Purpose: The employment of Magnetic resonance (MR) in investigations of cerebral tissue in health and disease achieved during the last 3 decades great appreciation. Its spectacular results in MR imaging and spectroscopy are especially useful in the domain of brain

A 9-year-old girl without prior trauma presented with weakness and headache. Examination showed profound left hemiplegia. MRI demonstrated a right middle cerebral artery (MCA) territory infarction. Magnetic resonance angiography showed proximal right MCA irregularity. Conventional angiography revealed an intracranial dissection (figure). Intracranial dissections are frequently spontaneous (nont...