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Rohani, S A, Mahdavi, S R, Mostaar, A, Ueltzhöffer, S, Mohammadi, R, Geraily, Gh. (1397). Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D. سامانه مدیریت نشریات علمی, 9(1), 29-36. doi: 10.31661/jbpe.v0i0.1045
S A Rohani; S R Mahdavi; A Mostaar; S Ueltzhöffer; R Mohammadi; Gh Geraily. "Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D". سامانه مدیریت نشریات علمی, 9, 1, 1397, 29-36. doi: 10.31661/jbpe.v0i0.1045
Rohani, S A, Mahdavi, S R, Mostaar, A, Ueltzhöffer, S, Mohammadi, R, Geraily, Gh. (1397). 'Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D', سامانه مدیریت نشریات علمی, 9(1), pp. 29-36. doi: 10.31661/jbpe.v0i0.1045
Rohani, S A, Mahdavi, S R, Mostaar, A, Ueltzhöffer, S, Mohammadi, R, Geraily, Gh. Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D. سامانه مدیریت نشریات علمی, 1397; 9(1): 29-36. doi: 10.31661/jbpe.v0i0.1045

Physical and Dosimetric Aspect of Euromechanics Add-on Multileaf Collimator on Varian Clinac 2100 C/D

Journal of Biomedical Physics and Engineering
مقاله 4، دوره 9، شماره 1، اردیبهشت 2019، صفحه 29-36    اصل مقاله (667.47 K)
نوع مقاله: Original Research
شناسه دیجیتال (DOI): 10.31661/jbpe.v0i0.1045
نویسندگان
S A Rohani1؛ S R Mahdavi2؛ A Mostaar3؛ S Ueltzhöffer4؛ R Mohammadi5؛ Gh Geraily* 1
1Department of Medical Physics, Tehran University of Medical Sciences, Tehran, Iran
2Radiation biology research center & medical Physics department, faculty of medicine, Iran University of Medical Sciences, Tehran, Iran
3Department of Medical Physics, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4Department of Clinic for Radiotherapy and RadioOncology, Medical Faculty Mannheim of the University of Heidelberg, Heidelberg, Germany
5Department of Medical Physics, Iran University of Medical Sciences, Tehran, Iran
چکیده
Background: Before treatment planning and dose delivery, quality assurance of multi-leaf collimator (MLC) has an important role in intensity-modulated radiation therapy (IMRT) due to the creation of multiple segments from optimization process.
Objective: The purpose of this study is to assess the quality control of MLC leaves using EBT3 Gafchromic films.
Material and Methods: Leaf Position accuracy and leaf gap reproducibility were checked with Garden fence test. The garden fence test consists of 5 thin bands A) 0.2 Cm width spaced at 2 Cm intervals and B) 1 Cm width spaced at 1 Cm intervals. Each leaf accuracy was analyzed with measuring the full-width half-maximum (FWHM). Maximum and average leaf transmission were measured with gafchromic EBT3 films from Ashland for both 6 MV and 18 MV beams.
Results: Leaf positions were found to be in a range between 1.78 – 2.53 mm, instead of nominal 2 mm for the test A and between 9.09 – 10.36 mm, instead of nominal 10 mm for the test B. The Average radiation transmission of the MLC was noted 1.79% and 1.98% of the open 10x10 Cm2 field at isocenter for 6 MV and 18 MV beams, respectively. Maximum radiation transmission was noted 4.1% and 4.4% for 6 MV and 18 MV beams, respectively.
Conclusion: In this study, application of gafchromic EBT3 films for the quality assurance of Euromechanics multileaf collimator was studied. Our results showed that the average leaf leakage and positional accuracy of this type of MLC were in the acceptance level based on the Protocols.
کلیدواژه‌ها
Multileaf Collimator؛ Mechanical Test؛ Garden Fence Test؛ Leaf Transmission؛ Leaf End Transmission
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