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

Author

Frey, E.C. ; Ju, Z.-W. ; Tsui, B.M.W.

Author_Institution

Dept. of Biomed. Eng., North Carolina Univ., Chapel Hill, NC, USA

Volume

40

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

1192

Lastpage

1197

Abstract

Slab derived scatter estimation (SDSE) accurately models the asymmetric, spatially varying scatter response function in uniformly attenuating objects with convex surfaces. This model is 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. Scatter compensation with iterative reconstruction does not involve the use of arbitrary adjustable parameters. A new fast algorithm for implementing SDSE that reduces computation time by a factor of 16 compared to a direct implementation is presented. Projection data computed with the new algorithm compare well with data from Monte Carlo simulations

Keywords

computerised tomography; medical image processing; patient diagnosis; radioisotope scanning and imaging; (SPECT); Monte Carlo simulations; iterative reconstruction techniques; projector-backprojector; scatter compensation; single-photon emission computed tomography; slab derived scatter estimation; Attenuation; Computational modeling; Computed tomography; Electromagnetic scattering; Image reconstruction; Imaging phantoms; Iterative algorithms; Particle scattering; Shape; Single photon emission computed tomography;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.256735

Filename

256735