3-D maximum a posteriori estimation for single photon emission computed tomography on massively-parallel computers

Author

Miller, M.I. ; Butler, C.S.

Author_Institution

Dept. of Electr. Eng., Washington Univ., St. Louis, MO, USA

Volume

12

Issue

3

fYear

1993

fDate

9/1/1993 12:00:00 AM

Firstpage

560

Lastpage

565

Abstract

A fully three-dimensional (3-D) implementation of the maximum a posteriori (MAP) method for single photon emission computed tomography (SPECT) is demonstrated. The 3-D reconstruction exhibits a major increase in resolution when compared to the generation of the series of separate 2-D slice reconstructions. As has been noted, the iterative EM algorithm for 2-D reconstruction is highly computational; the 3-D algorithm is far worse. To accommodate the computational complexity, previous work in the 2-D arena is extended, and an implementation on the class of massively parallel processors of the 3-D algorithm is demonstrated. Using a 16000- (4000-) processor MasPar/DECmpp-Sx machine, the algorithm is demonstrated to execute at 2.5 (7.8) s/EM-iteration for the entire 64×64×64 cube of 96 planar measurements obtained from the Siemens Orbiter rotating camera operating in the high-resolution mode

Keywords

computerised tomography; radioisotope scanning and imaging; 2D slice reconstructions; 3D maximum a posteriori estimation; MasPar/DECmpp-Sx machine; SPECT; Siemens Orbiter rotating camera; high-resolution mode; iterative EM algorithm; massively-parallel computers; medical diagnostic imaging; nuclear medicine; planar measurements; single photon emission computed tomography; Attenuation; Detectors; Image reconstruction; Iterative algorithms; Maximum a posteriori estimation; Maximum likelihood detection; Maximum likelihood estimation; Optical collimators; Optical computing; Single photon emission computed tomography;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.241884

Filename

241884