Compensation for collimator divergence in SPECT using inverse Monte Carlo reconstruction

Author

Floyd, C.E., Jr. ; Jaszczak, R.J. ; Manglos, S.H. ; Coleman, R.E.

Author_Institution

Duke Univ. Med. Center, Durham, NC, USA

Volume

35

Issue

1

fYear

1988

Firstpage

784

Lastpage

787

Abstract

The inverse Monte Carlo (IMC) reconstruction algorithm achieved compensation for two degrading collimator effects in SPECT (single-photon-emission computed tomography) imaging: position dependence and radial/tangential asymmetry in reconstructed resolution. With filtered backprojection using a ramp filter, full width at half maximum (FWHM, radial and tangential, respectively) for a line source on axis with a high-sensitivity collimator were 19.3 mm and 16.4 mm. At 12 cm off axis, FWHM were 14.8 mm and 8.2 mm, respectively. With IMC after 35 iterations, FWHM on axis were 8.4 mm and 7.7 mm and off axis were 6.0 mm and 7.4 mm, respectively. Thus, for the simple imaging task of line sources with no background activity using simulated projection data, IMC provides compensation for the collimator effects in addition to providing higher resolution.<>

Keywords

Monte Carlo methods; computerised tomography; radioisotope scanning and imaging; SPECT; collimator divergence; filtered backprojection; inverse Monte Carlo reconstruction; position dependence; radial/tangential asymmetry; ramp filter; single-photon-emission computed tomography; Cameras; Collimators; Degradation; High-resolution imaging; Image reconstruction; Image resolution; Monte Carlo methods; Optical imaging; Reconstruction algorithms; Spatial resolution;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.12832

Filename

12832