Spatial properties of the scatter response function in SPECT

Author

Frey, E.C. ; Tsui, B.M.W.

Author_Institution

Dept. of Radiol. & Curriculum in Biomed. Eng., North Carolina Univ., Chapel Hill, NC, USA

Volume

38

Issue

2

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

789

Lastpage

794

Abstract

It was previously shown by the authors (ibid., vol.37, no.3, p.1308-15, 1990) that the scatter response function (SRF) in single photon emission computed tomography (SPECT) imaging can be fit using a fitting function consisting of the sum of a Gaussian and two half-Gaussians with different widths. In the present work, the fitting parameters are studied as a function of source position in a cylindrical water-filled phantom for a low-resolution (LR), high-sensitivity collimator. It is found that each fitting parameter can be described in terms of a single geometric parameter. The useful parameters include the source depth and the distance to the edge of the phantom. However, for a low-energy general-purpose collimator, it may be more useful to parameterize the SRF as the product or other function of the SRF for a semiinfinite slab, and an aperture function which depends on the shape of the surface of the phantom. This parameterization of the SRF is useful for scatter compensation in SPECT

Keywords

computerised tomography; radioisotope scanning and imaging; Gaussian; SPECT; aperture function; cylindrical water-filled phantom; fitting function; geometric parameter; low-resolution high-sensitivity collimator; medical diagnostic imaging; nuclear medicine; parameterization; scatter compensation; scatter response function; semiinfinite slab; single photon emission computed tomography; source depth; source position; Apertures; Biomedical imaging; Collimators; Computational modeling; Computer simulation; Energy resolution; Imaging phantoms; Scattering; Shape; Slabs;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.289392

Filename

289392