Investigation of an efficient source design for Cobalt-60-based tomotherapy using EGSnrc Monte Carlo simulations

Physics in Medicine and Biology
Chandra P JoshiL John Schreiner

Abstract

Recent investigations demonstrate a strong potential for Cobalt-60 (Co-60)-based tomotherapy. Reported work suggests that Co-60-based tomotherapy offers a clinically and commercially viable alternative to megavoltage x-ray-based tomotherapy. Tomotherapy applications use a combination of intensity-modulated fan beams to deliver highly conformal radiotherapy. However, conventional Co-60 units are designed to give large uniform rectangular fields using an isotropic radioactive source in a cylindrical geometry. Such cylindrical source geometry likely provides a sub-optimal use of the radioactivity within the source volume for tomotherapy applications due to a significant loss of radiated energy outside the fan beam collimation system. To investigate a more efficient source geometry suitable for Co-60 tomotherapy applications, a computer code was written to model an isotropic source in a 6-faced polyhedron geometry such as cube, parallelepiped, prism and truncated pyramid. This code was integrated with the existing EGSnrc/BEAMnrc Monte Carlo (MC) code. The integrated source code was thoroughly tested, validated and used to investigate the energy spectra, radiation output and self-shielding properties of various rectangular-shaped (R...Continue Reading

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Citations

Jan 26, 2010·Journal of Medical Physics·L John SchreinerSandeep Dhanesar
Jan 26, 2010·Journal of Medical Physics·Chandra P JoshiL John Schreiner
Aug 10, 2013·Medical Physics·Sandeep DhanesarL John Schreiner
Apr 2, 2011·Medical Physics·Patrick Cadman, Karl Bzdusek
Sep 11, 2014·Journal of Applied Clinical Medical Physics·Yingjie XuJianrong Dai
Sep 11, 2014·Health Physics·John Schreiner, Matthew Marsh
Aug 13, 2021·Physics in Medicine and Biology·Hyojun ParkChul Hee Min

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