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.: Home > International Journal of Medical Sciences > 2004 > Volume 1 Number 2 > Joseph A. Both, Todd Pawlicki

Monte Carlo Commissioning of Low Energy Electron Radiotherapy Beams using NXEGS Software

Joseph A. Both, Todd Pawlicki
Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA
Abstract :

This work is a report on the commissioning of low energy electron beams of a medical linear accelerator for Monte Carlo dose calculation using NXEGS software (NXEGS version 1.0.10.0, NX Medical Software, LLC). A unique feature of NXEGS is automated commissioning, a  process whereby a combination of analytic and Monte Carlo methods generates beam models from dosimetric data collected in a water phantom. This study uses NXEGS to commission 6, 9, and 12 MeV electron beams of a Varian Clinac 2100C using three applicators with standard inserts. Central axis depth-dose, primary axis and diagonal beam profiles, and output factors are the measurements necessary for commissioning of the code. We present a comparison of measured dose distributions with the distributions generated by NXEGS, using confidence limits on seven measures of error. We find that confidence limits are typically less than 3% or 3 mm, but increase with increasing source to surface distance (SSD) and depth at or beyond R50. We also investigate the dependence of
NXEGS’ performance on the size and composition of data used to commission the program, finding a weak dependence on number of dose profiles in the data set, but finding also that commissioning data need be measured at only two SSDs.

Keywords :
Monte Carlo, electron beam commissioning, NXEGS

Date Deposited : 04 Aug 2011 10:05

Last Modified : 04 Aug 2011 10:05

Official URL: http://www.medsci.org/archive

Volume 1, Number 2, - 2004

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