The effect of very small air gaps on small field dosimetry

Charles, P.H., Crowe, S.B., Kairn, T., Kenny, J., Lye, J., Dunn, L., Hill, B., Knight, R.T., Langton, C.M., Trapp, J.V., & Lehmann, J. (2013) The effect of very small air gaps on small field dosimetry. Australasian Physical and Engineering Sciences in Medicine, 36(1), pp. 71-72.

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Abstract

The purpose of this study was to investigate the effect of very small air gaps (less than 1 mm) on the dosimetry of small photon fields used for stereotactic treatments. Measurements were performed with optically stimulated luminescent dosimeters (OSLDs) for 6 MV photons on a Varian 21iX linear accelerator with a Brainlab lMLC attachment for square field sizes down to 6 mm 9 6 mm. Monte Carlo simulations were performed using EGSnrc C++ user code cavity. It was found that the Monte Carlo model used in this study accurately simulated the OSLD measurements on the linear accelerator. For the 6 mm field size, the 0.5 mm air gap upstream to the active area of the OSLD caused a 5.3 % dose reduction relative to a Monte Carlo simulation with no air gap...

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ID Code: 71414
Item Type: Journal Article
Refereed: Yes
Additional Information: Abstracr of 2012 Engineering and Physical Sciences in Medicine Conference
Jupiter’s Casino, Gold Coast, 2–6th December 2012
DOI: 10.1007/s13246-012-0168-7
ISSN: 1879-5447
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Deposited On: 12 May 2014 23:04
Last Modified: 06 Sep 2016 02:55

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