NDLI: Polar pixels for high resolution small animal PET

Content Provider	IEEE Xplore Digital Library
Author	Mora, C. Rafecas, M.
Copyright Year	2006
Description	Author affiliation: Instituto de Fisica Corpuscular, Univ. de Valencia (Mora, C.; Rafecas, M.)
Abstract	In this work, we introduce polar-pixel basis functions for iterative reconstruction of small animal PET data. Our aim was to accelerate the reconstruction when using a system matrix stored on-disk, as well as the Monte-Carlo simulations related to the calculation of the matrix. The study was restricted to 2D. A common approach to reduce the number of the system matrix elements to be calculated and stored is using symmetries. While the conventional Cartesian discretization usually constraints the symmetries to three planes, a polar-pixel discretization of the FOV allows all the symmetries of a PET scanner to be used. We have simulated a two-head small animal PET scanner (4-steps rotation). The symmetries of the scanner allowed the FOV to be subdivided into 16 sectors. For comparison purposes, a Cartesian discretization of the image in pixels of size 0.5 times 0.5 $mm^{2}$ was also used. Three polar-pixel schemes were tested: (a) Polar pixels of constant area (equal to the area of the Cartesian pixels) and constant radial length; (b) square-like polar pixels, whose radial length was equal to the length of the Cartesian pixels, and (c) square-like polar pixels as in (b), excepting the pixels at the center of FOV, which were substituted by a circular pixel. The system matrix and various phantoms were calculated using Monte-Carlo simulations, and the algorithm MLEM was implemented. The results show that polar-pixel schemes (b) and (c) yield images very similar to the Cartesian ones, and only negligible degradation effects on image quality were observed.
Starting Page	2812
Ending Page	2817
File Size	265385
Page Count	6
File Format	PDF
ISBN	1424405602
ISSN	10957863
DOI	10.1109/NSSMIC.2006.356463
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Animals Positron emission tomography Image reconstruction Acceleration Pixel Testing Matrices Imaging phantoms Degradation Image quality image reconstruction small animal PET polar pixels system matrix Monte¿Carlo simulations
Content Type	Text
Resource Type	Article

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