Fast protocol for radiochromic film dosimetry using a cloud computing web application

Calvo-Ortega, J.F.; Pozo, Miquel; Moragues, Sandra; Casals, Joan

doi:10.1016/j.ejmp.2017.05.072

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…Measurements of the OF for the IMRT– and SBRT–style fields (Table 1 ) were carried out using EBT3 radiochromic film (Ashland Inc., Wayne, NJ, USA). Film was used according to recommendations from the manufacturer and the literature [ 13 ], and to our previous experience [ 14 ].…”

Section: Methodsmentioning

confidence: 99%

PRIMO Monte Carlo software benchmarked against a reference dosimetry dataset for 6 MV photon beams from Varian linacs

2018

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BackgroundThe software PRIMO for the Monte Carlo simulation of radiotherapy linacs could potentially act as a independent calculation system to verify the calculations of treatment planning systems. We investigated the suitability of the PRIMO default beam parameters to produce accurate dosimetric results for 6 MV photon beams from Varian Clinac 2100 linacs and 6 MV flattening–filter–free photon beams from Varian TrueBeam linacs.MethodsSimulation results with the DPM algorithm were benchmarked against a published reference dosimetry dataset based on point measurements of 25 dosimetric parameters on a large series of linacs. Studied parameters (for several field sizes and depths) were: PDD, off–axis ratios, and output factors for open fields and IMRT/SBRT–style fields. For the latter, the output factors were also determined with radiochromic film and with a small–sized ionization chamber. Benchmark data, PRIMO simulation results and our experimental results were compared.ResultsPDD, off–axis ratios, and open–field output factors obtained from the simulations with the PRIMO default beam parameters agreed with the benchmark data within 2.4% for Clinac 2100, and within 1.3% for TrueBeam. Higher differences were found for IMRT/SBRT–style output factors: up to 2.8% for Clinac 2100, and up to 3.3% for TrueBeam. Experimental output factors agreed with benchmark data within 1.0% (ionization chamber) and within 1.9% (radiochromic film).ConclusionsPRIMO default initial beam parameters for 6 MV photon beams from Varian Clinac 2100 linacs and 6 MV FFF photon beams from Varian TrueBeam linacs allowed agreement within 3.3% with a dosimetry database based on measurements of a high number of linacs. This finding represents a first step in the validation of PRIMO for the independent verification of radiotherapy plans.Electronic supplementary materialThe online version of this article (10.1186/s13014-018-1076-0) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

PRIMO Monte Carlo software benchmarked against a reference dosimetry dataset for 6 MV photon beams from Varian linacs

2018

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“…with RC software the agreement is between 87.6% and 99.8% using fast protocol for IMRT plans with 3%, 3 mm criteria and 10% threshold. 41 …”

Section: Discussionmentioning

confidence: 99%

Comparison of three film analysis softwares using EBT2 and EBT3 films in radiotherapy

Pócza

Zongor

Melles-Bencsik

et al. 2020

Radiology and Oncology

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Introduction The purpose of the study was to compare the results of gamma value based film analysis according to the used type of self-developer film and software product. Material and methods The films were irradiated with different treatment techniques such as 3D conformal and intensity modulated radiotherapy with static and rotational delivery. Stereotactic plans with conformal and intensity modulated arc techniques, using coplanar and non-coplanar beam setup were also evaluated. The data of irradiated film were compared with the planned planar dose distribution exported from the treatment planning system. Three film analysis software programs were evaluated: PTW Mephysto (PTW), FilmQA Pro (FQP) and radiohromic.com(RC). Both EBT2 and EBT3 types of films were examined. The comparisons of dose distributions were performed with gamma analysis using 10% cut-off level. Results The results of the gamma analysis for larger fields were between 78.3% and 98.3%, 75.7% and 100%, 80.2% and 98.8% with PTW, FQP and RC, respectively. The results of evaluation in case of stereotactic measurements were 76.8%–99.2% for PTW, 95.7%–100% for FQP and 91.2%–99.9% for RC. Conclusions All the three software programs are suitable for calibrating and evaluating films, performing gamma analysis, and can be used for patient specific quality assurance measurements. There is no direct connection between gamma passing rate and absolute accuracy or software quality, it is just a feature of the software. The interpretation of own results has to be defined on an institutional level according to given workflow and preliminary results.

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“…Gafchromic EBT3 film (Ashland, Bridgewater, NJ, USA) 37 , 38 was normally used for high-resolution dose measurement free of washing, presenting many attractive characteristics compared to other dosimeters: high spatial resolution, weak energy dependence in a wide photon energy range, near tissue-equivalence, small dose rate and fractionation dependence, no angular dependence. The film reading process was composed of 3 steps: 1. lot calibration with film strips; 2. film scanning and reading; and 3. film calibration and gamma evaluation.…”

Section: Methodsmentioning

confidence: 99%

“…In steps 1 and 2, Epson 800 (Epson, Long Beach CA, USA) was adopted as the film scanner, and the scanning for film strips and films was performed both prior to and after irradiation, using a resolution of 50 dpi, 48-bit full-color, reflection mode, and multichannel dosimetry (all red–green–blue channels), with all color corrections in the scanner turned off. In step 3, www.radiochromic.com , a Food and Drug Administration-approved online web application was used as a film calibration and analysis tool to analyze measured in-plane dose distribution on the film 37 , 38 and the functionality of lateral correction for the film was enabled in this software.…”

Section: Methodsmentioning

confidence: 99%

Multileaf Collimator Modeling and Commissioning for Complex Radiation Treatment Plans Using 2-Dimensional (2D) Diode Array MapCHECK2

Guo,

Zhu,

Zeng

et al. 2024

Technol Cancer Res Treat

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Purpose: This study aims to develop a data-collecting package ExpressMLC and investigate the applicability of MapCHECK2 for multileaf collimator (MLC) modeling and commissioning for complex radiation treatment plans. Materials and methods: The MLC model incorporates realistic parameters to account for sophisticated MLC features. A set of 8 single-beam plans, denoted by ExpressMLC, is created for the determination of parameters. For the commissioning of the MLC model, 4 intensity modulated radiation therapy (IMRT) plans specified by the AAPM TG 119 report were transferred to a computed tomography study of MapCHECK2, recalculated, and compared to measurements on a Varian accelerator. Both per-beam and composite-beam dose verification were conducted. Results: Through sufficient characterization of the MLC model, under 3%/2 mm and 2%/2 mm criteria, MapCHECK2 can be used to accurately verify per beam dose with gamma passing rate better than 90.9% and 89.3%, respectively, while the Gafchromic EBT3 films can achieve gamma passing rate better than 89.3% and 85.7%, respectively. Under the same criteria, MapCHECK2 can achieve composite beam dose verification with a gamma passing rate better than 95.9% and 90.3%, while the Gafchromic EBT3 films can achieve a gamma passing rate better than 96.1% and 91.8%; the p-value from the Mann Whitney test between gamma passing rates of the per beam dose verification using full MapCHECK2 package calibrated MLC model and film calibrated MLC model is .44 and .47, respectively; the p-value between those of the true composite beam dose verification is .62 and .36, respectively. Conclusion: It is confirmed that the 2-dimensional (2D) diode array MapCHECK2 can be used for data collection for MLC modeling with the combination of the ExpressMLC package of plans, whose doses are sufficient for the determination of MLC parameters. It could be a fitting alternative to films to boost the efficiency of MLC modeling and commissioning without sacrificing accuracy.

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Fast protocol for radiochromic film dosimetry using a cloud computing web application

Cited by 8 publications

References 21 publications

PRIMO Monte Carlo software benchmarked against a reference dosimetry dataset for 6 MV photon beams from Varian linacs

PRIMO Monte Carlo software benchmarked against a reference dosimetry dataset for 6 MV photon beams from Varian linacs

Comparison of three film analysis softwares using EBT2 and EBT3 films in radiotherapy

Multileaf Collimator Modeling and Commissioning for Complex Radiation Treatment Plans Using 2-Dimensional (2D) Diode Array MapCHECK2

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