Cerebral angiostratigraphy: first practical results.

The limitations of the standard angio-stratigraphic procedures with the classical projections, and even with supplementary views (oblique and under-the-chin-bregmatic), led us to devise a technic whereby the intracranial vascular system could be demonstrated at various levels simultaneously. This technic, which has been described in an earlier publication (1), permits dissociation of the different components of the intracranial vessels, freed from confusing superimposed shadows. With a single injection of contrast material, not exceeding in amount that used in standard stratigraphy (10 c.c.), projections of several layers of the cerebral circulation are achieved simultaneously. The advantages of such a procedure are apparent, since repeated injections of the medium for demonstration of individual layers, such as would otherwise be required for this purpose, are obviously out of the question. With the new technic, five stratigrams can be obtained, separated from one another by a distance of 1.0 cm., either...