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Content Provider | IEEE Xplore Digital Library |
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Author | Liang, Z. |
Copyright Year | 1992 |
Description | Author affiliation: Dept. of Radiol., State Univ. of New York, Stony Brook, NY, USA (Liang, Z.) |
Abstract | A mathematical method was studied to model the detector response of high-spatial-resolution positron emission tomography systems consisting of close-packed small crystals, and to restore the resolution deteriorated due to crystal penetration and/or nonuniform sampling across the field of view (FOV). The simulated detector system has 600 bismuth germanate crystals of 3.14 mm width and 3 cm length packed on a single ring of 60 cm diameter. The space between crystals was filled up with lead (i.e., septa). Each crystal was in coincidence with 200 opposite crystals so that the FOV had a radius of 30 cm. The detector response was modeled based on the attenuating properties of the crystals and the septa, and the geometry of the detector system. The modeled detector response function was used to restore the projections from the sinogram of the ring detector system. The projections had a uniform sampling of 1.57 mm across the FOV and had the crystal penetration and/or the nonuniform sampling compensated. A chest phantom with a few small circular cold objects ( approximately=4 mm diameter) located at the center and near the periphery of the FOV was computer-generated and used to test the restoration. The reconstructed images from the restored projections demonstrated resolution improvement off the FOV center, while preserving the resolution near the center. |
Starting Page | 951 |
Ending Page | 953 |
File Size | 301500 |
Page Count | 3 |
File Format | |
ISBN | 0780308840 |
DOI | 10.1109/NSSMIC.1992.301096 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 1992-10-25 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Detectors Radioactive decay Image restoration Crystals Nonuniform sampling Image resolution Mathematical model Positron emission tomography Bismuth Solid modeling |
Content Type | Text |
Resource Type | Article |
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