Abstract
Traditional CT systems face a tradeoff between temporal resolution, volumetric coverage and cone beam artifacts and
also have limited ability to customize the distribution of incident x-rays to the imaging task. Inverse geometry CT
(IGCT) can overcome some of these limitations by placing a small detector opposite a large, rotating scanned source
array. It is difficult to quickly rotate this source array to achieve rapid imaging, so we propose using stationary source
arrays instead and investigate the feasibility of such a system. We anticipate that distinct source arrays will need to be
physically separated, creating gaps in the sinogram. Symmetry can be used to fill the missing rays except those
connecting gaps. With three source arrays, a large triangular field of view emerges. As the small detector orbits the
patient, each source spot must be energized at multiple specifically designed times to ensure adequate sampling. A
timing scheme is proposed that avoids timing clashes, efficiently uses the detector, and allows for simple collimation.
The two-dimensional MTF, noise characteristics, and artifact levels are all found to be comparable to parallel-beam
systems. A complete, 100 millisecond volumetric scan may be feasible.
