Monte carlo N-particle transport code simulation of Leksell gamma knife using disk sources of polystyrene, PMMA, plastic water and head phantom

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Philippine Journal of Science

Volume

145

Issue

3

First Page

271

Last Page

274

Publication Date

1-1-2016

Abstract

Stereotactic radiosurgery (SRS) has become a standard modality for the treatment of benign and metastatic brain lesions that were deemed medically unsuitable for surgery. The Leksell Gamma Knife (LGK), a type of SRS that was used in this study, has 201 Cobalt-60 sources distributed in a hemisphere whose radiation intersects at the isocenter. The relative dose at the isocenter was verified using Monte Carlo N-Particle Simulation (MCNP). This study uses disk sources, an alternative for the full geometry collimator system of the LGK, to simulate a 160-mm water phantom made of different materials: polystyrene, plastic water, and PMMA (Polymethyl methacrylate). In addition, the simulation of a head phantom was also included in this study. Relative dose distributions were calculated and were compared to the relative dose distributions from the cited literatures. As a result, no significant differences have been found. In conclusion, the use of disk sources provides a simpler method of simulating the LGK instead of using the full geometry collimator system in the MCNP Visual Editor. © 2016, Science and Technology Information Institute. All rights reserved.

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Disciplines

Other Physics

Keywords

Stereoencephalotomy; Radiosurgery

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