Distributed 3-D iterative reconstruction for quantitative SPECT
Ju, Z.-W.
Frey, E.C.
Tsui, B.M.W.
Dept. of Biomed. Eng., North Carolina Univ., Chapel Hill, NC;
This paper appears in: Nuclear Science, IEEE Transactions on
Publication Date: Aug 1995
Volume: 42,
Issue: 4
On page(s): 1301-1309
Meeting Date: 10/30/1994 - 11/05/1994
Location: Norfolk, VA, USA
ISSN: 0018-9499
References Cited: 16
CODEN: IETNAE
INSPEC Accession Number: 5053464
Digital Object Identifier: 10.1109/23.467865
Posted online: 2002-08-06 19:12:39.0
Abstract
We describe a distributed three dimensional (3-D) iterative
reconstruction library for quantitative single-photon emission computed
tomography (SPECT). This library includes 3-D projector-backprojector
pairs (PBPs) and distributed 3-D iterative reconstruction algorithms.
The 3-D PBPs accurately and efficiently model various combinations of
the image degrading factors including attenuation, detector response and
scatter response. These PBPs were validated by comparing projection data
computed using the projectors with that from direct Monte Carlo (MC)
simulations. The distributed 3-D iterative algorithms spread the
projection-backprojection operations for all the projection angles over
a heterogeneous network of single or multi-processor computers to reduce
the reconstruction time. Based on a master/slave paradigm, these
distributed algorithms provide dynamic load balancing and fault
tolerance. The distributed algorithms were verified by comparing images
reconstructed using both the distributed and non-distributed algorithms.
Computation times for distributed 3-D reconstructions running on up to 4
identical processors were reduced by a factor approximately 80-90% times
the number of the processors participating, compared to those for
non-distributed 3-D reconstructions running on a single processor. When
combined with faster affordable computers, this library provides an
efficient means for implementing accurate reconstruction and
compensation methods to improve quality and quantitative accuracy in
SPECT images
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