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Speedup OS-EM image reconstruction by PC graphics card technologies for quantitative SPECT with varying focal-length fan-beam collimation

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4 Author(s)
Zigang Wang ; Dept. of Radiol., State Univ. of New York, Stony Brook, NY, USA ; Guoping Han ; Tianfang Li ; Zhengrong Liang

In this paper, we present a new hardware acceleration method to speedup the ordered-subsets expectation-maximization (OS-EM) algorithm for quantitative single photon emission computed tomography (SPECT) image reconstruction with varying focal-length fan-beam (VFF) collimation. By utilizing the geometrical symmetry of VFF point-spread function (PSF), compensation for object-specific attenuation and system-specific PSF are accelerated using currently available PC video/graphics card technologies. A tenfold acceleration of quantitative SPECT reconstruction is achieved.

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Nuclear Science, IEEE Transactions on  (Volume:52 ,  Issue: 5 )