Photon pencil kernel parameterisation based on beam quality index

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
Tufve NyholmMikael Karlsson

Abstract

New treatment techniques in radiotherapy employ increasing dose calculation complexity in treatment planning. For an adequate check of the results coming from a modern treatment planning system, clinical tools with almost the same degree of generality and accuracy as the planning system itself are needed. To fulfil this need we propose a photon pencil kernel parameterization based on a minimum of input data that can be used for phantom scatter calculations. Through scatter integration the pencil kernel model can calculate common parameters, such as TPR or phantom scatter factors, used in various dosimetric QA (quality assurance) procedures. The proposed model originates from an already published radially parameterized pencil kernel. A depth parameterization of the pencil kernel parameters has been introduced, based on a large database containing commissioned beam data for a commercial treatment planning system. The entire pencil kernel model demands only one photon beam quality index, TPR20,10, as input. By comparing the dose calculation results to the extensive experimental data set in the database, it has been possible to make a thorough analysis of the resulting accuracy. The errors in calculated doses, normalized to the ref...Continue Reading

References

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Citations

Oct 7, 2006·Medical Physics·Jörgen OlofssonMikael Karlsson
Oct 2, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Dietmar GeorgMikael Karlsson
Dec 10, 2009·Medical Physics·Timothy C ZhuUNKNOWN AAPM Therapy Physics Committee Task Group 74
Jan 14, 2012·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Fredrik NordströmSven J Bäck
Feb 8, 2011·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Nils KadesjöJörgen Olofsson
Oct 27, 2016·Medical Physics·Bin LiangQiuwen Wu
Nov 22, 2013·Journal of Applied Clinical Medical Physics·Stephen SteciwBrad Warkentin
Aug 4, 2006·Physics in Medicine and Biology·T NyholmM Karlsson
Nov 18, 2006·Physics in Medicine and Biology·Tufve NyholmMikael Karlsson
Nov 26, 2010·Physics in Medicine and Biology·Karin Eklund, Anders Ahnesjö
Mar 1, 2007·Physics in Medicine and Biology·Jörgen OlofssonMikael Karlsson

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