ABSTRACT
Rapid X-ray imaging systems can provide dynamic recordings of internal moving organs. X-ray contrast angiography, which involves injection of radiopaque substances into the bloodstream, enables visualization of the circulation to, from, and within almost any organ of the body. The developent of X-ray-computed tomography (CT) in the 1970s has had a revolutionary impact on diagnostic imaging with X-rays because it eliminates or greatly minimizes these problems. Several investigations have described potential use of X-ray CT for fundamental studies of the heart, lungs, and circulation. Most X-ray CT scanners require a few seconds to produce a single two-dimensional image of a cross section of the body. A film or screen containing a radiation-sensitive material is exposed to the X-rays transmitted through a region of the body. In the Dynamic Spatial Reconstructor, the relatively large X-ray source-to-object distance results in a small subtended angle in forming the projection image.
