Monte Carlo calculated beam quality correction factors for two cylindrical ionization chambers in photon beams

被引:9
|
作者
Alissa, Mohamad [1 ]
Zink, Klemens [1 ,2 ,3 ]
Tessier, Frederic [4 ]
Schoenfeld, Andreas A. [5 ]
Czarnecki, Damian [1 ]
机构
[1] Univ Appl Sci Giessen THM, Inst Med Phys & Radiat Protect, Giessen, Germany
[2] Univ Med Ctr Giessen & Marburg, Dept Radiotherapy & Radiat Oncol, Marburg, Germany
[3] Marburg Ionbeam Therapyctr MIT, Marburg, Germany
[4] CNR, Ionizat Radiat Stand, Ottawa, ON, Canada
[5] Sun Nucl Corp, 3275 Suntree Blvd, Melbourne, FL 32940 USA
来源
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS | 2022年 / 94卷
关键词
Dosimetry; Beam quality correction factor; Ionization chamber; Monte Carlo simulation; MV photon beams; HIGH-ENERGY PHOTON; ELECTRON-TRANSPORT; SIMULATION; K(Q);
D O I
10.1016/j.ejmp.2021.12.012
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: Although several studies provide data for reference dosimetry, the SNC600c and SNC125c ionization chambers (Sun Nuclear Corporation, Melbourne, FL) are in clinical use worldwide for which no beam quality correction factors kQ are available. The goal of this study was to calculate beam quality correction factors kQ for these ionization chambers according to dosimetry protocols TG-51, TRS 398 and DIN 6800-2. Methods: Monte Carlo simulations using EGSnrc have been performed to calculate the absorbed dose to water and the dose to air within the active volume of ionization chamber models. Both spectra and simulations of beam transport through linear accelerator head models were used as radiation sources for the Monte Carlo calculations. Results: kQ values as a function of the respective beam quality specifier Q were fitted against recommended equations for photon beam dosimetry in the range of 4 MV to 25 MV. The fitting curves through the calculated values showed a root mean square deviation between 0.0010 and 0.0017. Conclusions: The investigated ionization chamber models (SNC600c, SNC125c) are not included in above mentioned dosimetry protocols, but are in clinical use worldwide. This study covered this knowledge gap and compared the calculated results with published kQ values for similar ionization chambers. Agreements with published data were observed in the 95% confidence interval, confirming the use of data for similar ionization chambers, when there are no kQ values available for a given ionization chamber.
引用
收藏
页码:17 / 23
页数:7
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