MR angiography is a non-invasive technique which can provide important information about cerebral vascular diseases such as cerebral aneurysms or occlusive lesions. As recent progress in MR angiography, image quality has become excellent and acquisition time has become much shorter. After introduction of a new multidetector helical CT scanner, it has become possible to produce high-speed CT angiography of high quality with significantly shorter acquisition time for the intracranial and cervical vessels. The feasibility of 3D views of intracranial and cervical vessels computed from planar digital angiograms acquired with a rotational angiography system has been evaluated. In the cases with aneurysm, 3D angiography is superior to conventional DSA concerning visualization of the aneurysm architecture.
