Hydrogenated Amorphous Silicon (A-Si:H) Based Gamma Camera - Monte Carlo Simulations
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 × 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.
H. Lee et al., "Hydrogenated Amorphous Silicon (A-Si:H) Based Gamma Camera - Monte Carlo Simulations," Proceedings of SPIE - The International Society for Optical Engineering, SPIE -- The International Society for Optical Engineering, Jan 1994.
The definitive version is available at https://doi.org/10.1117/12.174282
Medical Imaging 1994: Physics of Medical Imaging
Mining and Nuclear Engineering
Article - Conference proceedings
© 1994 SPIE -- The International Society for Optical Engineering, All rights reserved.