Fig 4.

Four-dimensional DSA reconstruction from a 3D-DSA reconstruction performed for evaluation of an unruptured paraclinoid aneurysm. An IA injection of contrast was used for this examination. The top row shows selected timeframes viewed at the rate of 6 frames per second at a fixed viewing angle. The bottom row shows the same timeframes viewed at 4 different angles, which would have not been obtainable in a biplane acquisition because of the mechanical inability to position the A-plane gantry (red icon).