Technical note : modelling a complex micro-multileaf collimator using the standard BEAMnrc distribution

Kairn, Tanya, Kenny, John, Crowe, Scott, Fielding, Andrew L., Franich, Rick, Johnston, Peter, Knight, Richard, Langton, Christian M., Schlect, David, & Trapp, Jamie (2010) Technical note : modelling a complex micro-multileaf collimator using the standard BEAMnrc distribution. Medical Physics, 37(4), pp. 1761-1767.

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Purpose: The component modules in the standard BEAMnrc distribution may appear to be insufficient to model micro-multileaf collimators that have tri-faceted leaf ends and complex leaf profiles. This note indicates, however, that accurate Monte Carlo simulations of radiotherapy beams defined by a complex collimation device can be completed using BEAMnrc's standard VARMLC component module.----------

Methods: That this simple collimator model can produce spatially and dosimetrically accurate micro-collimated fields is illustrated using comparisons with ion chamber and film measurements of the dose deposited by square and irregular fields incident on planar, homogeneous water phantoms.----------

Results: Monte Carlo dose calculations for on- and off-axis fields are shown to produce good agreement with experimental values, even upon close examination of the penumbrae.---------

Conclusions: The use of a VARMLC model of the micro-multileaf collimator, along with a commissioned model of the associated linear accelerator, is therefore recommended as an alternative to the development or use of in-house or third-party component modules for simulating stereotactic radiotherapy and radiosurgery treatments. Simulation parameters for the VARMLC model are provided which should allow other researchers to adapt and use this model to study clinical stereotactic radiotherapy treatments.

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ID Code: 31804
Item Type: Journal Article
Refereed: Yes
Keywords: Monte Carlo, MLC, small field dosimetry, radiochromic film
DOI: 10.1118/1.3355873
ISSN: 0094-2405
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 American Association of Physicists in Medicine
Deposited On: 15 Apr 2010 23:49
Last Modified: 29 Feb 2012 14:16

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