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Article type: Research Article
Authors: Asadi, Amina | Razavi-Ratki, Seid Kazemb; d | Jabbari, Keyvanc | Najafzadeh, Milada | Nickfarjam, Abolfazla; b; *
Affiliations: [a] Medical Physics Department, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran | [b] Radiotherapy Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran | [c] Medical Physics Department, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran | [d] Radiology Department, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Correspondence: [*] Corresponding author: Abolfazl Nickfarjam, Medical Physics Department, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Professor Hesabi Blvd., Alem Sq., Yazd, Iran. Tel.: +98 915 108 9102; Fax: +98 353 821 1222; E-mails: nickfarjam6262@gmail.com and a.nickfarjam@ssu.ac.ir.
Abstract: OBJECTIVES:To evaluate the potential privileges of flattening filter-free (FFF) photon beams from Oncor® linac for 6 MV and 18 MV energies. METHODS:A Monte Carlo (MC) model of Oncor® linac was built using BEAMnrc MCCode and verified by the measured data using 6 MV and 18 MV energies. A comprehensive set of data was also characterized for MC model of Oncor® machine running with and without flattening filter (FF) for 6 MV and 18 MV beams in six field sizes. The investigated characteristics included mean energy, energy spectrum, photon spatial fluence, superficial dose, percent depth dose (PDD), dose output, and out-of-field dose with two indexes of lateral dose profile and isodose curve at three depths. RESULTS:Using FFF enhanced the energy uniformity 3.4±0.11% (6 MV) and 2.05±0.09% (18 MV) times and improved dose output by factor of 2.91 (6 MV) and 4.2 (18 MV) on the central axis, respectively. Using FFF also reduced the PDD dependencies by 9.1% (6 MV) and 5.57% (18 MV). In addition, using FFF had a lower out-of-field dose due to the reduced head scatter and softer spectra. CONCLUSIONS:The findings in this study suggested that using FFF, Oncor® machine could achieve better treatment results with lower dose toxicity and a shorter beam-on time.
Keywords: Radiation therapy, medical linear accelerator, flattening filter, Monte Carlo calculations, BEAMnrc, Monte Carlo code
DOI: 10.3233/XST-17315
Journal: Journal of X-Ray Science and Technology, vol. 26, no. 2, pp. 281-302, 2018
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