PMID: 9167166May 1, 1997Paper

Refinements of the finite-size pencil beam model of three-dimensional photon dose calculation

Medical Physics
O Z OstapiakJ Van Dyk

Abstract

Modern three-dimensional (3-D) photon dose calculation algorithms need to be fast and accurate if they are to be practical for treatment optimization. Refinements to a previously proposed finite-size pencil beam (FSPB) method are presented in order to fulfill these needs. Specifically, a fast Fourier transform (FFT) convolution technique is used to speed calculation of the FSPB; the fluence spectrum is modeled, and the effects of finite source size, a Gaussian x-ray source intensity profile and partial transmission through a multileaf collimator (MLC) leaf are approximated. The use of FFT techniques in the calculation of small diverging fields involves approximations that are investigated for a 6 MV beam and shown to introduce errors that vary with energy but do not exceed 0.7% on the central axis. Dose distributions calculated by FSPB superposition are in excellent agreement with those calculated by full field FFT convolution. Two key advances over the original implementation of the FSPB model are demonstrated: the fast calculation of the FSPB facilitates development, and the incorporation of realistic beam parameters enables accurate modeling of clinical beams.

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Citations

Apr 21, 2006·Australasian Physical & Engineering Sciences in Medicine·A MackV Seifert
Jun 1, 2005·Australasian Physical & Engineering Sciences in Medicine·K M AyyangarC A Enke
Nov 13, 2001·International Journal of Radiation Oncology, Biology, Physics·UNKNOWN Intensity Modulated Radiation Therapy Collaborative Working Group
Jun 10, 2010·Medical Physics·Daniel LétourneauDavid A Jaffray
Jul 19, 2002·The British Journal of Radiology·D W McRobbie, R A Quest
Nov 7, 2015·Computational and Mathematical Methods in Medicine·Oleg BlyussRobert Molchanov
Jan 22, 1998·Medical Physics·E WongY Zhu
Aug 31, 2002·Medical Physics·William H Hinson, J Daniel Bourland
Apr 9, 2005·Physics in Medicine and Biology·U JeleńM Alber
Oct 2, 2009·Physics in Medicine and Biology·Xuejun GuSteve B Jiang
Dec 10, 1999·Physics in Medicine and Biology·A Ahnesjö, M M Aspradakis
May 8, 1999·Physics in Medicine and Biology·M H PhillipsA R Hounsell
Nov 22, 2007·Physics in Medicine and Biology·P Rassiah-SzegediB Salter
Nov 4, 2021·Biomedical Physics & Engineering Express·Hunter StephensQiuwen Wu

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