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Proceedings Paper

Hydrogenated amorphous silicon (a-Si:H) based gamma camera--Monte Carlo simulations
Author(s): Hyoung-Koo Lee; John S. Drewery; Wan Shick Hong; Tao Jing; Selig N. Kaplan; Ali Mireshghi; Victor Perez-Mendez
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Paper Abstract

A new gamma camera using a-Si:H photodetectors has been designed for the imaging of heart and other small organs. In this new design the photomultiplier tubes and the position sensing circuitry are replaced by 2D array of a-Si:H p-i-n pixel photodetectors and readout circuitry which are built on a substrate. Without the photomultiplier tubes this camera is light weight, hence can be made portable. To predict the characteristics and the performance of this new gamma camera we did Monte Carlo simulations. In the simulations 128 X 128 imaging array of various pixel sizes were used. 99mTc (140 keV) and 201Tl (70 keV) were used as radiation sources. From the simulations we could obtain the resolution of the camera and the overall system, and the blurring effects due to scattering in the phantom. Using the Wiener filter for image processing, restoration of the blurred image could be achieved. Simulation results of a-Si:H based gamma camera were compared with those of a conventional gamma camera.

Paper Details

Date Published: 1 May 1994
PDF: 12 pages
Proc. SPIE 2163, Medical Imaging 1994: Physics of Medical Imaging, (1 May 1994); doi: 10.1117/12.174282
Show Author Affiliations
Hyoung-Koo Lee, Lawrence Berkeley Lab. (United States)
John S. Drewery, Lawrence Berkeley Lab. (United States)
Wan Shick Hong, Lawrence Berkeley Lab. (United States)
Tao Jing, Lockheed Martin Fairchild Sys. (United States)
Selig N. Kaplan, Lawrence Berkeley Lab. (United States)
Ali Mireshghi, Lawrence Berkeley Lab. (United States)
Victor Perez-Mendez, Lawrence Berkeley Lab. (United States)


Published in SPIE Proceedings Vol. 2163:
Medical Imaging 1994: Physics of Medical Imaging
Rodney Shaw, Editor(s)

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