A fast projector-backprojector pair modeling the asymmetric, spatially varying scatter response function for scatter compensation in SPECT imaging

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/23.256735· OSTI ID:6011560

Frey, E C; Tsui, B M.W. ^[1]; Ju, Z W ^[2]

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1. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Biomedical Engineering Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Radiology
2. Univ. of North Carolina, Chapel Hill, NC (United States). Dept of Biomedical Engineering

The authors previously developed a method, slab derived scatter estimation (SDSE), for quickly and accurately modeling the asymmetric, spatially varying scatter response function in uniformly attenuating objects with convex surfaces. This model has been implemented in a projector-backprojector that, when combined with iterative reconstruction techniques, provides accurate scatter compensation in single-photon emission computed tomography (SPECT). These iterative reconstruction based scatter compensation techniques have the advantage that they use all detected photons, avoiding the noise amplification occurring with subtraction based schemes. In addition, scatter compensation with iterative reconstruction does not involve the use of arbitrary adjustable parameters. In this paper, they present a new fast algorithm for implementing SDSE that reduces computation time by a factor of 16 compared to a direct implementation. Projection data computed with the new algorithm compare well with that from Monte Carlo simulations. When combined with faster computers and iterative reconstruction algorithms that converge rapidly, this fast projector-backprojector pair makes iterative reconstruction based scatter compensation feasible.

• OSTI ID: 6011560
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Vol. 40:4 part 1; ISSN 0018-9499
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
SCATTERING
ALGORITHMS
MONTE CARLO METHOD
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BOSONS
CALCULATION METHODS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
ELEMENTARY PARTICLES
EMISSION COMPUTED TOMOGRAPHY
MASSLESS PARTICLES
MATHEMATICAL LOGIC
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