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Collimator for Variable Sensitivity and Spatial Resolution Without the Need for Exchange

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Title: Collimator for Variable Sensitivity and Spatial Resolution Without the Need for Exchange
Authors: Kubo, Naoki Browse this author →KAKEN DB
Tsuchiya, Katsutoshi Browse this author
Shiga, Tohru Browse this author
Kojima, Shinichi Browse this author
Suzuki, Atsuro Browse this author
Ueno, Yuichiro Browse this author
Kobashi, Keiji Browse this author
Tamaki, Nagara Browse this author
Keywords: Monte Carlo simulation
Issue Date: 8-Aug-2014
Publisher: IEEE
Journal Title: IEEE Transactions on Nuclear Science
Volume: 61
Issue: 5
Start Page: 2489
End Page: 2493
Publisher DOI: 10.1109/TNS.2014.2333748
Abstract: A new design of collimator is proposed that has variable sensitivity and spatial resolution, eliminating the need for exchanging collimators in a gamma camera. Using Monte Carlo simulations, the present article evaluates the shielding of undesirable gamma rays in a parallel-hole collimator. It consists of a number of layers of rectangular holes. These layers consist of alternately stacked fixed and movable collimators. In high-resolution mode, the movable collimators are shifted by half the aperture pitch along the diagonal direction. The first collimator (type A) has 50 layers with fixed thicknesses of 1.2 mm. The second collimator (type B) has 25 layers with a thickness of 1.0 mm on the object side and 25 layers with a thickness of 1.4 mm on the opposite side. The third collimator (type C) has 20 layers with non-uniform thicknesses. The ratios of the maximum artificial peak to the main-peak are calculated for point-source responses. The ratios for types A, B, and C collimators are 0.78, 0.08, and 0.03, respectively. The same performance for shielding undesirable gamma rays is achieved in the type C collimator as for a conventional collimator.
Rights: © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Type: article (author version)
Appears in Collections:安全衛生本部 (Office of Health and Safety) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久保 直樹

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