Sanghee Cho et al 2009 Phys. Med. Biol. 54 467 doi:10.1088/0031-9155/54/3/001
Sanghee Cho, Sangtae Ahn, Quanzheng Li and Richard M Leahy
Show affiliationsThe image reconstruction problem for fully 3D TOF PET is challenging because of the large data sizes involved. One approach to this problem is to first rebin the data into one of the following lower dimensional formats: 2D TOF, 3D non TOF or 2D non TOF. Here we present a unified framework based on a generalized projection slice theorem for TOF data that can be used to compute each of these mappings. We use this framework to develop approaches for rebinning into non TOF formats without significant loss of information. We first derive the exact mappings and then describe approximations which address the missing data problem for oblique sinograms. We evaluate the performance of approximate rebinning using Monte Carlo simulations. Our results show that rebinning into non TOF sinograms retains significant SNR advantages over sinograms collected without TOF information.
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87.57.uk Positron emission tomography (PET)
Issue 3 (7 February 2009)
Received 7 July 2008, in final form 7 November 2008
Published 6 January 2009
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