Rotational cerebral angiography: procedure and value

Rotational cerebral angiography provides continuously chang-ing projections and correspondingly excellent visualization of aneurysms or other vascular malformations requiring special or obl ique views. Rotation angiography as part of the routine an-giography gives a three-dimensional impression with one injec-tion and series of films. Although additional subtraction tech-nique is not possible and the injection time has to be prolonged, the technique is nevertheless advantageous compared with mag-nification angiography and angiotomography in the preoperative evaluation of cerebral vascular malformations. Since computed tomography (CT) is generally available, angiog-raphy is no longer necessary for many diagnostic problems, includ-ing some that also require special projections, stereoscopic studies, or tomographic examinations. Comparable progress has not been achieved in the precise demonstration of small vascular structures