Iterative method and apparatus for x-ray computed tomographic fluoroscopy
US Patent 6,101,236
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
In the present invention, an iterative process is provided for computed tomographic fluoroscopy (CTF) based upon an ordered-subset based algorithm or an adaptation of the row-action expectation maximization (RAEM) formula. This process is applied to reduce metal artifacts in CTF imaging, reduce image noise and provide rapid-image updating suitable for real-time applications. In one embodiment, generation of a projection mask and computation of a relaxation matrix are used to compensate for beam divergence and data incompleteness, and a priori knowledge such as a known image support is used to reduce image reconstruction errors.
Wang, Ge; Schweiger, Gary D.; and Vannier, Michael W. Iterative method and apparatus for x-ray computed tomographic fluoroscopy. US Patent 6,101,236 filed October 02, 1998 and issued August 08, 2000. https://ir.uiowa.edu/patents/242