PMID: 11930912Apr 5, 2002Paper

Quality assurance in IMRT: importance of the transmission through the jaws for an accurate calculation of absolute doses and relative distributions

Medical Physics
Juan Diego AzconaIgnacio Azinovic

Abstract

The goal of IMRT is to achieve an isodose distribution conformed to the tumor while avoiding the organs at risk. For these tasks several gantry angles are selected, each one containing a series of different leaf configurations for the multileaf collimator (MLC) (segments). Verifying the relative distributions as well as the absolute doses is an important step for quality assurance issues. We have observed that an accurate modeling of the transmission of the primary x-ray fluence through the jaws and MLC as well as the head scatter is crucial for a precise calculation of relative doses and monitor units. Also, an inaccurate calculation of the output factor for small size segments can lead to important differences in the absolute dose for points under these segments. Incorrect models could lead to systematic errors of around 5% to 10% in the calculated monitor units and a shift in the isodose curves.

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Citations

Mar 5, 2004·Australasian Physical & Engineering Sciences in Medicine·P TangboonduangjitP Metcalfe
Dec 4, 2003·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Marco SchwarzEugène M F Damen
Feb 28, 2003·International Journal of Radiation Oncology, Biology, Physics·Yong Yang, Lei Xing
Jul 23, 2011·Medical Physics·Jan RødalEirik Malinen
May 22, 2009·Journal of Applied Clinical Medical Physics·R Alfredo Siochi
Mar 19, 2005·Physics in Medicine and Biology·I ChauvetJ C Rosenwald
Nov 28, 2015·Physics in Medicine and Biology·Juan Diego AzconaJavier Burguete
Jul 28, 2016·Journal of Applied Clinical Medical Physics·Paul KinsellaBrian Langan

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