Reprojection and backprojection in SPECT image reconstruction

Author

Liang, Z. ; Jaszczak, R. ; Floyd, C. ; Greer, K. ; Coleman, R.

Author_Institution

Dept. of Radiol., Duke Univ. Med. Center, Durham, NC, USA

fYear

1989

fDate

9-12 Apr 1989

Firstpage

919

Abstract

An algorithm compensating the deterministic effects of photon attenuation, scattering, and collimator divergence associated with quantitative SPECT (single-photon-emission computed tomography) images is presented. The compensation algorithm is based on a technique which traces the geometrical relations of pixels and projection rays. If the attenuation map of the source distribution and the collimator divergence function are known, the compensation is accurate. The implementation of the compensation algorithm within the reprojection processes is carried out in an iterative manner for computer-generated ideal data. Improvement in image reconstruction of SPECT is demonstrated. An analytical study of implementing the compensation algorithm, the backprojection process, is given. A Bayesian analysis is used to suppress the artifacts due to the low count detection of photons associated with SPECT. A comparison of the BIP (Bayesian image processing) and ML (maximum-likelihood) methods on image reconstruction is carried out for computer-generated ideal and Poisson randomized data. Improved images using the BIP method are obtained

Keywords

Bayes methods; compensation; computerised picture processing; computerised tomography; radioisotope scanning and imaging; Bayesian analysis; Bayesian image processing; SPECT image reconstruction; artifacts; attenuation map; backprojection; collimator divergence; compensation algorithm; computer-generated ideal data; geometrical relations; maximum-likelihood; photon attenuation; quantitative SPECT; reprojection; single-photon-emission computed tomography; Algorithm design and analysis; Attenuation; Bayesian methods; Computed tomography; Electromagnetic scattering; Image reconstruction; Iterative algorithms; Optical collimators; Particle scattering; Single photon emission computed tomography;

fLanguage

English

Publisher

ieee

Conference_Titel

Southeastcon '89. Proceedings. Energy and Information Technologies in the Southeast., IEEE

Conference_Location

Columbia, SC

Type

conf

DOI

10.1109/SECON.1989.132531

Filename

132531