Digital rotational radiography in neuroradiology.

Different angiographic techniques (e.g., multiple oblique views, angiotomography, and magnification angiography) have been proposed to improve the diagnosis of cerebral vascular malformations and occlusive diseases. However, these methods are either time-consuming or necessitate repeated injections of contrast medium. The common goals of all these techniques are (1) to achieve a documentation of the lesion, free of other superimposing structures, and (2) to provide a three-dimensional image of the lesion. Cornelis et al. [1] first proposed an angiographic rotation technique to overcome these problems. Later, Voigt et al. [2] and Thron and Voigt [3] introduced it into clinical use. In these studies, however, difficulties in exposure time were not solved and subtraction films were not available. This article reports a new technique with improved DSA equipment [4], which allows exact automatic exposure control of two pictures per second, subtraction technique, and applicability to myelography.