Title :
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
fDate :
4/1/1991 12:00:00 AM
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;
Journal_Title :
Nuclear Science, IEEE Transactions on
