These images were aquired by rapid injection of iodinated contrast material through a catheter placed into the right internal carotid artery, with rapid sequential radiographs obtained.
The image is aquired in a lateral projection, which optimizes viewing of the cavernous segment of the internal carotid artery. The course of the anterior cerebral artery is seen, parallelling the corpus callosum. The bifurcation of the internal carotid artery and middle cerebral artery are not well visualized in this projection.
On this image, the bones are included. On the subsequent images, the bones have been 'subtracted', which increases the conspicuity of the opacified vessels.