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Abstract
The incidence of intracranial aneurysms in the general population has been reported to be between 1.5 and 8% . Ninety percent of the aneurysms become symptomatic as a result of rupture with consequent subarachnoid hemorrhage (SAH), with a peak age between 40 and 60 years. Mortality is high among patients with this condition, and prompt detection and evaluation of the aneurysm is critical for determining the appropriate endovascular or neurosurgical intervention.
Digital substraction angiography (DSA) is currently the standard method for detection and evaluation of intracranial aneurysms. However, this method is invasive, time consuming, relatively expensive, and associated with a 0.5% risk of permanent neurologic complications.
Unlike DSA, MRA has the advantage of high sensitivity to the flow phenomena, therefore cerebral vessels can be displayed without contrast medium administration. However, although MR angiography (MRA) has given very good results in detecting aneurysms in acute SAH , it is often impractical in severely affected patients, due to long examination time, low spatial resolution compared to DSA, high cost, sensitivity to motion artifacts, difficulties in demonstrating vessels with low flow conditions, not providing good delineation of calcium and bony landmarks and is not optimal for assessing post aneurysm clipping status