Clinical Feasibility of Leakage and Transmission Radiation Dosimetry Using Multileaf Collimator of ELEKTA Synergy-S Accelerator During Conventional Radiotherapy

Li, Jun; Zhang, Xizhi; Gui, Long-Gang; Zhang, Jie; Tang, Xiaobin; Ge, Yun; Chen, Ying; Chen, Da

doi:10.1166/jmihi.2016.1706

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Carlos Daniel Venencia et al [17] and Thomas Losasso et al [28] measured the leaf leakage of 120-leaf MLC model Millennium of Varian Clinac21EX 1.5% for 6 MV Beam. Jun Li and et al [29] have measured the average MLC transmission of ELEKTA model Synergy-s about 2% and the leaf end transmission rate from 25% to 30% for 6MV,10MV and 18MV beams.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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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.

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Section: Resultsmentioning

confidence: 99%

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

et al. 2019

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“…The measured leaf width at isocenter is suitable for 3D conformal and IMRT treatments (7.6 mm). Jun li et al [17], and Indra J. Das et al [3] have measured the leaf width of ELEKTA Synergy-S MLC and Siemens Double focused MLC, 4 mm and 1 cm, respectively. Some limitations were imposed on the field size in few cases like spinal cord, due to the reduction of clearance after fitting the MLC below the gantry head as an add-on.…”

Section: Discussionmentioning

confidence: 99%

Commissioning and quality assurance of Euromechanics add-on multileaf collimator

Rohani

Mahdavi

Mostaar

et al. 2020

Biomed. Phys. Eng. Express

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In this study, the beam characteristics of a Euromechanics add-on MLC that has been installed on a Varian CLINAC 2100 C/D linear accelerator are presented. This was the first installation of 60-leaf PMLC from Euromechanics Company worldwide and all mechanical and dosimetric parameters were measured before clinical use of this kind of MLC. Mechanical tests were executed for different gantry and collimator angles. Leaf position accuracy and leaf gap reproducibility were checked with four different tests. The leaf transmissions, collimator (Sc), phantom (Sp), total (Sc,p) scatter factors, output of the machine, beam profiles for off-axis ratios, central axis depth dose, flatness, symmetry and penumbra have been measured for different field sizes pre and post MLC installation in 6 and 18 MV-mode. To evaluate the effect of new data on clinical plans, different beam setup configurations conformed with MLC and custom blocks were planned on CT images of thorax a CIRS phantom model 002LFC in the same treatment planning system. Leaf position in picket fence test found to be in range between 4.89–5.02 cm instead of nominal 5 cm, however the results of this test with EPIDs image and PIPSpro software showed the higher deviation rather than the results reported from the tests with EBT3 films. The measured data showed that on average Sc,p and Sc were increased 0.22% (P = 0.86) and 0.34% (P = 0.86) for 6 MV and 0.37% (P = 0.84) and 0.42% (P = 0.88) for 18 MV beams for different field sizes, respectively. Good agreement was observed between the PDD and profile curves pre and post MLC installation that was expected based on no changes in beam energy and geometry of the collimators. Based on the mechanical and dosimetry results which have been achieved from our different standard tests, it was found no significant differences between pre and post MLC installation values. This indicates, installation and using this system is clinically acceptable.

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“…Relying on detailed information cited in the usually published advanced papers, head linac has been simulated using GATE [ 11 ]. Figure 1 displays the global variant structure of the technique applied to simulate the linear accelerator and the water phantom considered in this study.…”

Section: Methodsmentioning

confidence: 99%

Monte Carlo evaluation of particle interactions within the patient-dependent part of Elekta 6 MV photon beam applying IAEA phase space data

Krim

Bakari

Zerfaoui

et al. 2021

Rep Pract Oncol Radiother.

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Clinical Feasibility of Leakage and Transmission Radiation Dosimetry Using Multileaf Collimator of ELEKTA Synergy-S Accelerator During Conventional Radiotherapy

Cited by 6 publications

References 19 publications

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

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

Commissioning and quality assurance of Euromechanics add-on multileaf collimator

Monte Carlo evaluation of particle interactions within the patient-dependent part of Elekta 6 MV photon beam applying IAEA phase space data

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