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Proceedings Paper

Electronic portal imaging device (EPID) based on a novel camera with avalanche multiplication
Author(s): Gendi Pang; Wei Zhao; Randy P. Luhta; John A. Rowlands
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Paper Abstract

Electronic portal imaging devices (EPIDs) have many potential advantages over portal films used in radiation therapy. The most commonly used EPIDs are video-based systems. Camera noise is one of the main noise sources which limit the performance of current video-based EPIDs. In this paper, we investigate the use of an avalanche-multiplication-based video camera to effectively eliminate the camera noise in an EPID and, therefore, to improve the quality of megavoltage portal images. To make these investigations, a new EPID with the avalanche-multiplication-based video camera has been made. Detective quantum efficiency (DQE) of the new device has been measured with a 60Co radiation beam. It is shown that the camera noise is much smaller than the quantum noise in the new EPID system and the DQE value of the system is significantly increased because of the elimination of camera noise.

Paper Details

Date Published: 24 July 1998
PDF: 7 pages
Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); doi: 10.1117/12.317018
Show Author Affiliations
Gendi Pang, Sunnybrook Regional Cancer Ctr./Univ. of Toronto (Canada)
Wei Zhao, Sunnybrook Health Science Ctr./Univ. of Toronto (Canada)
Randy P. Luhta, Sunnybrook Health Science Ctr./Univ. of Toronto (United States)
John A. Rowlands, Sunnybrook Health Science Ctr./Univ. of Toronto (Canada)


Published in SPIE Proceedings Vol. 3336:
Medical Imaging 1998: Physics of Medical Imaging
James T. Dobbins; John M. Boone, Editor(s)

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