This video discusses the importance of considering carefully the residual components of geometric uncertainty that remain even after the introduction of daily online IGRT. Major components to the residual uncertainty are introduced, including delineation error uncorrected target rotation, intrafraction motion and registration error. Complexities in data collection or data analysis of these contributions are discussed. The bulk of the video will assume that centres wish to adapt the existing methodology set out in Geometric Uncertainties in Radiotherapy (BIR, 2003), but alternative margin methodologies including conclusions arising from radiobiological modelling will also be briefly investigated. References: British Institute of Radiology (BIR) Working Party (2003) “Geometric Uncertainties in Radiotherapy” Pub: BIR, London. ISBN 0-905749-53-7.
The educational aims of this video:
1 CPD credit
- Understand the impact of daily online IGRT on geometrical uncertainties in the radiotherapy process
- Be aware of how the complexity of the dominant contributors to the total uncertainty compares with the non-IGRT case
- Be provided with tools to better measure or understand the different sources of residual geometric uncertainty
- Appreciate the uncertainty with which both dosimetric or radiobiological models predict optimal margins for patient outcome.
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Dr Mark F. McEntee
Dr Mark McEntee is an internationally recognised researcher and teacher in diagnostic radiography. Taking a great interest in professional issues he became the President of the Irish Institute of Radiography and Radiation Therapy (2005-7) and an inaugural member of the health and social care professional council the regulatory body for health professional in Ireland (2008-11). He became a Senior lecturer in the University of Sydney in 2011 and an Associate Professor in 2014 and is heavily involved in curriculum renewal, teaching, and research. His teaching excellence has been recognised by the Vice Chancellor’s Award for excellence in Teaching at Sydney 2014, as well as several other faculty awards. He is an Honorary Professor of Radiography at the University of Salford, Manchester (UK), a Fellow of the Irish Institute of Radiography, and has been appointed as a expert consultant by the governments of Singapore and Tonga.