MR Angiography in the Diagnosis of Brain Aneurysms

Abstract

MR angiography represents a useful non-invasive tool to explore cerebral vessels. Two techniques of acquisition are generally used, based respectively on the “inflow effect” (time-of-flight technique) and on motion-related phase changes (phase contrast technique). The main advantage of MR angiography over conventional digital subtraction angiography is the lack of invasiveness; because of this it requires less technical training and may be easily repeated for follow-up purposes. On the other hand, the main disadvantages of this technique are limited spatial resolution, incomplete fresh blood saturation and difficulties in monitoring critical patients.

In our experience, MRA is routinely used in the screening of patients at risk for cerebral aneurysms, and in the follow-up of patients submitted to endovascular treatment.