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Original Article

Korean Journal of Medical Physics 2008; 19(4): 247-255

Published online December 25, 2008

Copyright © Korean Society of Medical Physics.

Coded Aperture Gamma Camera for Thyroid Imaging: Monte Carlo Simulation

갑상선 영상 획득을 위한 부호화 구경 감마카메라: 몬테칼로 시뮬레이션 연구

Cheol-Ha Beak, Seung-Jae Lee, Yong Hyun Chung

백철하ㆍ이승재ㆍ정용현

Department of Radiological Science, Yonsei University College of Health Science, Institute of Health Science, Yonsei University, Wonju, Korea

연세대학교 보건과학대학 방사선학과, 연세대학교 보건과학연구소

Abstract

A coded aperture camera has been developed to improve the signal-to-noise ratio (SNR) while keeping the spatial resolution of a pinhole gamma camera. The purpose of this study was to optimize a coded aperture camera and to evaluate its possibility for thyroid imaging by Monte Carlo simulation. A clinical gamma camera, a pinhole collimator with 1.0 mm hole diameter, and a 79×79 modified uniformly redundant array (MURA) mask were designed using GATE (Geant4 Application for Tomographic Emission). The penetration ratio, spatial resolution, integral uniformity and signal-to-noise ratio (SNR) were simulated and evaluated as a function of the mask thickness. The spatial resolution of the coded aperture camera was consistent with the various mask thickness, SNR showed a maximum value at 1.2 mm mask thickness and integral uniformity was improved by increasing mask thickness. Compare to the pinhole gamma camera, the coded aperture camera showed improved SNR by a factor of 30 while keeping almost the same spatial resolution. In this simulation study, the results indicated that high spatial resolution and ultra-high SNR of the thyroid imaging are feasible using a coded aperture camera.

KeywordsCoded-aperture, Pinhole, Gamma camera, GATE simulation

Korean Society of Medical Physics

Vol.35 No.4
December 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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