A prototype volume CT system for use in angiography has been constructed and tested initially using a simple phantom. This system consists of a fixed x-ray tube, an image intensifier, coupled to a solid state camera, and a computer-controlled turntable on which phantoms were placed. In order to explore the imaging performance of this system, subtraction projection images, acquired over a few projection angles (20), were digitized and used for single slice reconstruction. These data then were reconstructed using two iterative reconstruction algorithms, specifically designed for vascular structures. The quality of the resultant reconstructed images agrees with the results of previous computer simulation studies and indicates that the performance of our algorithms is superior to standard filtered-backprojection. The results also suggest that an image intensifier-based detector can be used for reconstructing 3-D vascular structures from a limited number of subtraction projections.
Robert A. Kruger,
"Image Intensifier-Based CT Volume Imager For Angiography", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); doi: 10.1117/12.968642; https://doi.org/10.1117/12.968642