28 May 1999 Computationally efficient cone beam CT reconstruction algorithm using circle-and-line orbit
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Abstract
In this paper we present an idea of combing data acquired from different scan geometry such as two mutually tilted circles and the circle-and-line orbits. The focus is on patching the shadow zone, a region where Radon data are not available from the single circular orbit, with data acquired from another (nonplanary) circular or linear orbits. Conventional two-step approaches are sophisticated and computationally intensive due to the fact that the entire cone beam projections are transformed into the Radon space (or some intermediate form) for patching, followed by an inverse transformation process. In contrast, by substituting the shadow zone with a shadow cone, we show that the patching process can be done in the three-dimensional (3D) Fourier space. Furthermore, we show that patching data in 2D Fourier space is possible for the case when it involves the circle-and-line orbit.
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Wen-Tai Lin, Wen-Tai Lin, } "Computationally efficient cone beam CT reconstruction algorithm using circle-and-line orbit", Proc. SPIE 3659, Medical Imaging 1999: Physics of Medical Imaging, (28 May 1999); doi: 10.1117/12.349479; https://doi.org/10.1117/12.349479
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