13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!


15 Jun 2015, 16:45
CCIS 1-160 (University of Alberta)

CCIS 1-160

University of Alberta

Oral (Non-Student) / orale (non-étudiant) Medical and Biological Physics / Physique médicale et biologique (DMBP-DPMB) M2-6 Radiation Therapy (DMBP-DNP) / Thérapie par rayonnement (DPMB-DPN)


Dr Gavin Cranmer-Sargison (Department of Medical Physics, Saskatchewan Cancer Agency)


Small field dosimetry is difficult, yet consistent data is necessary for the clinical implementation of advanced radiotherapy techniques. In this work we present improved experimental approaches required for standardizing measurement, Monte Carlo (MC) simulation based detector correction factors as well as methods for reporting experimental data. A range of measurements and MC modelling studies have been reported by our group. Based on these methods and results, recommendations are given as to: (1) commissioning/fine-tuning MC models for use in small field dosimetry, (2) correction factors for a range of shielded and unshielded diode detectors, (3) what constitutes a ‘very small field size’ - based on the different effects as field size gets smaller, (4) measurement methods necessary to control uncertainties at these very small field sizes and (5) reporting against an effective field size - taking into account measured dosimetric field size. The results of the work clearly show that measurement and modelling based methods can be standardized to improve the consistency in small field dosimetry. Through standardization the best accuracy possible can be achieved in these increasingly clinically-used conditions.

Primary author

Dr Gavin Cranmer-Sargison (Department of Medical Physics, Saskatchewan Cancer Agency)


Dr David Thwaites (University of Sydney, Institute of Medical Physics School of Physics, Sydney, Australia) Dr Jamie Trapp (Queensland University of Technology, School of Chemistry Physics and Mechanical Engineering, Brisbane, Australia) Dr Paul Charles (Radiation Oncology, Princess Alexandra Hospital, Brisbane, Australia) Dr Tanya Kairn (Genesis Cancer Care Queensland, Brisbane, Australia)

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