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2 March 2006 Image reconstruction in cone-beam CT with a spherical detector using the BPF algorithm
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Both flat-panel detectors and cylindrical detectors have been used in CT systems for data acquisition. The cylindrical detector generally offers a sampling of a transverse image plane more uniformly than does a flat-panel detector. However, in the longitudinal dimension, the cylindrical and flat-panel detectors offer similar sampling of the image space. In this work, we investigate a detector of spherical shape, which can yield uniform sampling of the 3D image space because the solid angle subtended by each individual detector bin remains unchanged. We have extended the backprojection-filtration (BPF) algorithm, which we have developed previously for cone-beam CT, to reconstruct images in cone-beam CT with a spherical detector. We also conduct computer-simulation studies to validate the extended BPF algorithm. Quantitative results in these numerical studies indicate that accurate images can be obtained from data acquired with a spherical detector by use of our extended BPF cone-beam algorithms.
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Nianming Zuo, Yu Zou, Tianzi Jiang, and Xiaochuan Pan "Image reconstruction in cone-beam CT with a spherical detector using the BPF algorithm", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61424J (2 March 2006);

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