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Title: Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator

Abstract

This article considers a hypothetical imaging device with a spinning slat collimator that measures parallel-planar-integral data from an object. This device rotates around the object 180 deg. and stops at N positions uniformly distributed over this 180 deg. . At each stop, the device spins on its own axis 180 deg. and acquires measurements at M positions uniformly distributed over this 180 deg. . For a fixed total imaging time, an optimal distribution of the scanning time among the data measurement locations is searched by a nonlinear programming method: Nelder-Mead's simplex method. The optimal dwell time is approximately proportional to the weighting factor in the backprojector of the reconstruction algorithm. By using an optimal dwell-time profile, the reconstruction signal-to-noise ratio has a gain of 23%-24% for the filtered backprojection algorithm and a gain of 10%-18% for the iterative algorithms, compared with the situation when a constant dwell-time profile is used.

Authors:
; ;  [1]
  1. Fidelity Investments, 201 South Main Street, Salt Lake City, Utah 84111 (United States)
Publication Date:
OSTI Identifier:
20726229
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 32; Journal Issue: 9; Other Information: DOI: 10.1118/1.2008447; (c) 2005 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ALGORITHMS; COLLIMATORS; DATA ACQUISITION; EQUIPMENT; INTEGRALS; ITERATIVE METHODS; NOISE; NONLINEAR PROGRAMMING; OPTIMIZATION; SIGNAL-TO-NOISE RATIO; SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY

Citation Formats

Earl, R D, Zeng, G L, Zhang, B, Department of Radiology, University of Utah, 729 Arapeen Drive, Salt Lake City, Utah 84108, and Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102. Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator. United States: N. p., 2005. Web. doi:10.1118/1.2008447.
Earl, R D, Zeng, G L, Zhang, B, Department of Radiology, University of Utah, 729 Arapeen Drive, Salt Lake City, Utah 84108, & Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102. Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator. United States. https://doi.org/10.1118/1.2008447
Earl, R D, Zeng, G L, Zhang, B, Department of Radiology, University of Utah, 729 Arapeen Drive, Salt Lake City, Utah 84108, and Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102. Thu . "Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator". United States. https://doi.org/10.1118/1.2008447.
@article{osti_20726229,
title = {Optimizing the acquisition time profile for a planar integral measurement system with a spinning slat collimator},
author = {Earl, R D and Zeng, G L and Zhang, B and Department of Radiology, University of Utah, 729 Arapeen Drive, Salt Lake City, Utah 84108 and Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84102},
abstractNote = {This article considers a hypothetical imaging device with a spinning slat collimator that measures parallel-planar-integral data from an object. This device rotates around the object 180 deg. and stops at N positions uniformly distributed over this 180 deg. . At each stop, the device spins on its own axis 180 deg. and acquires measurements at M positions uniformly distributed over this 180 deg. . For a fixed total imaging time, an optimal distribution of the scanning time among the data measurement locations is searched by a nonlinear programming method: Nelder-Mead's simplex method. The optimal dwell time is approximately proportional to the weighting factor in the backprojector of the reconstruction algorithm. By using an optimal dwell-time profile, the reconstruction signal-to-noise ratio has a gain of 23%-24% for the filtered backprojection algorithm and a gain of 10%-18% for the iterative algorithms, compared with the situation when a constant dwell-time profile is used.},
doi = {10.1118/1.2008447},
url = {https://www.osti.gov/biblio/20726229}, journal = {Medical Physics},
issn = {0094-2405},
number = 9,
volume = 32,
place = {United States},
year = {2005},
month = {9}
}