An efficient depth- and energy-dependent Monte Carlo model for columnar CsI detectors

Iacovos S. Kyprianou; Gabriel Brackman; Kyle J. Myers; Andreu Badal; Aldo Badano

doi:10.1117/12.772878

18 March 2008 An efficient depth- and energy-dependent Monte Carlo model for columnar CsI detectors

Iacovos S. Kyprianou, Gabriel Brackman, Kyle J. Myers, Andreu Badal, Aldo Badano

Proceedings Volume 6913, Medical Imaging 2008: Physics of Medical Imaging; 69130O (2008) https://doi.org/10.1117/12.772878
Event: Medical Imaging, 2008, San Diego, California, United States

Abstract

We developed an efficient, depth- and energy-dependent Monte Carlo model for columnar CsI detectors. The optical photon, electron/positron Monte Carlo package MANTIS developed by our group, was used to generate optical photon response and collection efficiency as a function of the x-ray/electron interaction depth for a realistic scintillator geometry. The detector geometry we used for the simulations was reported in the past and is based on a 500 μm thick columnar CsI scintilator. The resulting depth-dependent optical photon responses were fit to a parametrized Gaussian mixture model. The model parameters were the depth-dependent radial shift of the response peak, the depth dependent widths of the Gaussians, and the depth-dependent magnitude of the Gaussians in the mixture. The depth-dependent optical spread has a maximum spatial shift of 53 μm. The optical collection efficiency at the photo-diode layer followed a power law varying from 90% for interactions at the scintillator exit surface to 20% for interactions at the detector entrance. The responses were consequently incorporated into penMesh, a PENELOPE based Monte Carlo x-ray, electron/positron transport simulation package for generating clinically realistic images of triangular mesh phantoms. The resulting detector responses from this empirical model were compared against the full x-ray/electron/optical photon simulation using the package MANTIS, showing good agreement. The simulation speed, using the optical transport model in penMesh, increases by two orders of magnitude compared to MANTIS.

Citation Download Citation

Iacovos S. Kyprianou, Gabriel Brackman, Kyle J. Myers, Andreu Badal, and Aldo Badano "An efficient depth- and energy-dependent Monte Carlo model for columnar CsI detectors", Proc. SPIE 6913, Medical Imaging 2008: Physics of Medical Imaging, 69130O (18 March 2008); https://doi.org/10.1117/12.772878

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