NDLI: Space-variant and anisotropic resolution modeling in list-mode EM reconstruction

Content Provider	IEEE Xplore Digital Library
Author	Rahmim, A. Lenox, M. Michel, C. Reader, A.J. Sossi, V.
Copyright Year	2004
Description	Author affiliation: Dept. of Phys. & Astron., British Columbia Univ., Vancouver, BC, Canada (Rahmim, A.)
Abstract	One issue common to PET scanners is the space- variance of the point spread function (PSF): manifesting itself as resolution degradation as one moves away from the center of the field-of-view (FOV). This effect occurs due to a higher probability of inter-crystal penetration with higher angles of radiation incident on crystal fronts. Depth-of-interaction (DOI) encoding is known to improve this problem, but has not reached complete space-invariance. In this work, a space-variant PSF has been incorporated into the system matrix of a list-mode EM algorithm. Furthermore, in an effort to further extend generality and accuracy of the model, anisotropicity of the PSF has also been considered: finite resolution effects at any position in the FOV are allowed to have distinct values along the axial and the two transaxial directions, and are allowed to degrade differently with increasing distance from the center of the FOV. The spatial distribution of image resolution has been measured and fit using exponential and inverse-Gaussian functions. It is shown that the proposed modeling of the PSF, compared to space-invariant and isotropic modeling, improves resolution recovery across the FOV.
Starting Page	3074
Ending Page	3077
File Size	308893
Page Count	4
File Format	PDF
ISBN	0780382579
ISSN	10823654
DOI	10.1109/NSSMIC.2003.1352547
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Image reconstruction Degradation Spatial resolution Image resolution Extraterrestrial measurements Positron emission tomography Crystals Encoding Iterative methods
Content Type	Text
Resource Type	Article

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