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Proceedings Paper

Estimation-reconstruction approach for image reconstruction in halfscan computed tomography
Author(s): Xiaochuan Pan
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Paper Abstract

The fan-beam filtered backprojection (FFBP) algorithm has been widely used for image reconstruction in fan-beam computed tomography (CT). We have also developed fullscan-hybrid algorithms for image reconstruction in fan-beam CT. Numerical evaluation indicates that such fullscan-hybrid algorithms possess computational and noise properties superior to those of the FFBP algorithm. However, because these fullscan-hybrid algorithms involve the calculation of the Fourier series expansion of the fan-beam data, they require fullscan data acquired over an angular range of 2(pi) . Therefore, these fullscan-hybrid algorithms cannot be applied directly to a halfscan fan-beam data that are acquired only over an angular range of (pi) plus the fan angle. In this work, we present new reconstruction algorithms -- the halfscan-hybrid algorithms -- for image reconstruction in halfscan CT. These halfscan-hybrid algorithms have properties that are similar to those of the full-scan hybrid algorithms and that are superior to those of the widely used halfscan-FFBP algorithm. Such properties of the halfscan-hybrid algorithms may have significant implications to the accuracy and precision of lesion detection and parameter estimation in noisy CT images without increasing the radiation dose to the patient.

Paper Details

Date Published: 25 April 2000
PDF: 6 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384504
Show Author Affiliations
Xiaochuan Pan, Univ. of Chicago (United States)


Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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