PMID: 11324949Apr 28, 2001Paper

Point dose calculations using an analytical pencil beam kernel for IMRT plan checking

Physics in Medicine and Biology
Y Watanabe

Abstract

A method to verify the monitor units for a treatment plan is to calculate point doses, possibly at the isocentre, by using a simple calculation method. This verification is recommended to find mistakes in the treatment plan. Treatment plans for intensity modulated radiation therapy are no exception. The method should employ a simple physical model and a dose calculation algorithm, which is different from the method used for the treatment plan. Our approach uses a convolution algorithm and an analytical pencil beam kernel with eight parameters. The model is intuitive and simple. At the same time, the method is so general that it can be applied to both step-and-shoot and sliding-window techniques. The results of applications to actual treatment plans show that the calculated total isocentre doses are accurate within +/-2% of planned doses for six-field prostate plans when calculation points are in a uniform dose region. Head and neck cases show a slightly larger difference than prostate cases. When calculation points are located in a region of high dose gradient, however, the difference could be greater than 5%.

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Citations

Feb 16, 2008·Australasian Physical & Engineering Sciences in Medicine·R Almeida-Trinidad, H M Garnica-Garza
Oct 23, 2010·Medical Physics·Juan Diego Azcona, Javier Burguete
Jun 25, 2013·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Sankar ArumugamLois Holloway
Oct 2, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Dietmar GeorgMikael Karlsson
Sep 8, 2006·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Colin R BakerGeoff J Budgell
Feb 19, 2009·Journal of Applied Clinical Medical Physics·John P GibbonsIsaac Rosen
Nov 22, 2013·Journal of Applied Clinical Medical Physics·Stephen SteciwBrad Warkentin
Sep 11, 2014·Journal of Applied Clinical Medical Physics·Christopher L NelsonSteven M Kirsner
Nov 28, 2015·Physics in Medicine and Biology·Juan Diego AzconaJavier Burguete
Jul 13, 2002·Expert Review of Anticancer Therapy·Luca Cozzi, Antonella Fogliata

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