A new method for modeling the spatially-variant, object-dependent scatter response function in SPECT
- Univ. of North Carolina, Chapel Hill, NC (United States)
Scatter compensation using iterative reconstruction results in improved image quality and quantitative accuracy compared to subtraction-based methods. However, this requires knowledge of the spatially-varying, object-dependent scatter response function (SRF). We have previously developed a method, slab derived scatter estimation (SDSE) for estimating the SRF. However, this method has reduced accuracy for nonuniform attenuators and Tl-201 imaging. In this paper we present a new method which provides better modeling of the SRF for Tl-201 SPECT, and should provide improved accuracy for nonuniform attenuators. The method requires 3 image space convolutions and an attenuated projection for each viewing angle. Implementation in a projector-backprojector pair for use with an iterative reconstruction algorithm would require 2 image space Fourier transforms and 6 image space inverse Fourier transforms per iteration. We observed good agreement between SRFs and projection data estimated using this new model compared to those obtained using Monte Carlo simulations.
- OSTI ID:
- 513154
- Report Number(s):
- CONF-961123-; CNN: Grant R29-CA63465; Grant R01-CA39463; TRN: 97:014207
- Resource Relation:
- Conference: Institute of Electrical and Electronic Engineers (IEEE) nuclear science symposium and medical imaging conference, Anaheim, CA (United States), 2-9 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 IEEE nuclear science symposium - conference record. Volumes 1, 2 and 3; Del Guerra, A. [ed.]; PB: 2138 p.
- Country of Publication:
- United States
- Language:
- English
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