Measurement of depth-dose of linear accelerator and simulation by use of Geant4 computer code

Sardari, Dariush; Maleki, R.; Samavat, H.; Esmaeeli, A. D.

doi:10.1016/j.rpor.2010.03.001

Cited by 44 publications

(31 citation statements)

References 7 publications

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“…29,30 The gantry head of the linear accelerator was modelled by the Varian Monte Carlo study team using the Geant4 code. [31][32][33] Phase-space files containing information of the particle's type, location, orientation and energy for the 6 MV flattened and unflattened photon beams were then generated by the team and used in our simulations. 34 Since the scoring planes (planes at which the simulated beam phase-space data are scored) of the phase-space files generated by the Geant4 code were merely up to the position above the jaws, the BEAMnrc code 35 was used to transport the Geant4 phase-space file through the secondary collimator (X-Y jaws).…”

Section: Phase-space Files Of the Flattened And Unflattened Photon Beamsmentioning

confidence: 99%

A surface energy spectral study on the bone heterogeneity and beam obliquity using the flattened and unflattened photon beams

Chow

Owrangi

2016

Reports of Practical Oncology & Radiotherapy

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Section: Phase-space Files Of the Flattened And Unflattened Photon Beamsmentioning

confidence: 99%

A surface energy spectral study on the bone heterogeneity and beam obliquity using the flattened and unflattened photon beams

Chow

Owrangi

2016

Reports of Practical Oncology & Radiotherapy

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“…In our previous work, 35 the head of a clinical linear accelerator (Siemens Primus) was simulated based on the manufacturer's detailed information by use of GEANT4 MC code, and benchmarked with real clinical dosimetry in terms of percentage depth dose and beam profiles for various field sizes and depths, for a 6-MV photon beam.…”

Section: A Monte Carlo Simulations In the Presence Of A Magnetic Fmentioning

confidence: 99%

Improvement of dose distribution in breast radiotherapy using a reversible transverse magnetic field Linac-MR unit

et al. 2013

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Applying a reversible magnetic field during breast radiotherapy, not only reduces the dose to the lung and heart but also produces a sharp drop dose volume histogram for planning target volume, because of bending of the path of secondary charged particles toward the chest wall by the Lorentz force. The simulations have shown that use of the magnetic field at 1.5 T is not feasible for clinical applications due to the increase of ipsilateral chest wall skin dose in comparison to the conventional planning while 0.25 T is suitable for all patients due to dose reduction to the chest wall skin.

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“…[13][14][15][16][17][18][19] Recently, many methods have been applied to improve the calculation time for Monte Carlo simulation, which is used to verify the accuracy of radiotherapy. 20 GATE v8. 1 which is an open-source toolkit compatible with the Gean-t4 medical application system 21 was released.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of a GATE Monte Carlo platform in a clinical pretreatment QA system for VMAT treatment plans using TrueBeam with an HD120 multileaf collimator

Lee

Jeong

Chung

et al. 2019

J Applied Clin Med Phys

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PurposeTo evaluate the quality of patient‐specific complicated treatment plans, including commercialized treatment planning systems (TPS) and commissioned beam data, we developed a process of quality assurance (QA) using a Monte Carlo (MC) platform. Specifically, we constructed an interface system that automatically converts treatment plan and dose matrix data in digital imaging and communications in medicine to an MC dose‐calculation engine. The clinical feasibility of the system was evaluated.Materials and MethodsA dose‐calculation engine based on GATE v8.1 was embedded in our QA system and in a parallel computing system to significantly reduce the computation time. The QA system automatically converts parameters in volumetric‐modulated arc therapy (VMAT) plans to files for dose calculation using GATE. The system then calculates dose maps. Energies of 6 MV, 10 MV, 6 MV flattening filter free (FFF), and 10 MV FFF from a TrueBeam with HD120 were modeled and commissioned. To evaluate the beam models, percentage depth dose (PDD) values, MC calculation profiles, and measured beam data were compared at various depths (Dmax, 5 cm, 10 cm, and 20 cm), field sizes, and energies. To evaluate the feasibility of the QA system for clinical use, doses measured for clinical VMAT plans using films were compared to dose maps calculated using our MC‐based QA system.ResultsA LINAC QA system was analyzed by PDD and profile according to the secondary collimator and multileaf collimator (MLC). Values for MC calculations and TPS beam data obtained using CC13 ion chamber (IBA Dosimetry, Germany) were consistent within 1.0%. Clinical validation using a gamma index was performed for VMAT treatment plans using a solid water phantom and arbitrary patient data. The gamma evaluation results (with criteria of 3%/3 mm) were 98.1%, 99.1%, 99.2%, and 97.1% for energies of 6 MV, 10 MV, 6 MV FFF, and 10 MV FFF, respectively.ConclusionsWe constructed an MC‐based QA system for evaluating patient treatment plans and evaluated its feasibility in clinical practice. We observed robust agreement between dose calculations from our QA system and measurements for VMAT plans. Our QA system could be useful in other clinical settings, such as small‐field SRS procedures or analyses of secondary cancer risk, for which dose calculations using TPS are difficult to verify.

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Measurement of depth-dose of linear accelerator and simulation by use of Geant4 computer code

Cited by 44 publications

References 7 publications

A surface energy spectral study on the bone heterogeneity and beam obliquity using the flattened and unflattened photon beams

A surface energy spectral study on the bone heterogeneity and beam obliquity using the flattened and unflattened photon beams

Improvement of dose distribution in breast radiotherapy using a reversible transverse magnetic field Linac-MR unit

Feasibility of a GATE Monte Carlo platform in a clinical pretreatment QA system for VMAT treatment plans using TrueBeam with an HD120 multileaf collimator

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