Monte Carlo calculation of dosimetry parameters for a brachytherapy source

Belousov, A. V.; Калачев, А. А.; Osipov, A. S.

doi:10.3103/s0027134914060034

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…For the 192 Ir model: GI192M11, a study was made by Perez-Calatayud et al, (2012) using the Geant3 Monte Carlo code [1], Geant4 was used by Granero et al, (2005) for the same source model [6]. The comparison was also made in the case of radial dose function with the results obtained for the source model BEBIG Ir2.A852 simulated by Granero et al, (2008) [7] and Belousov et al, (2014) [8]. The obtained results in this study were in good coherence with the published data.…”

Section: Introductionsupporting

confidence: 79%

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Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Elboukhari¹,

Yamni²,

Ouabi³

et al. 2022

Dosimetry

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The purpose from this work is the investigation for dosimetric parameters of the two new BEBIG sources, 60Co and 192Ir used in high-dose-rate brachytherapy. According to the full report of AAPM and ESTRO; air-kerma strength, dose rate constant, radial dose function, and 2D along & away dose rates tables were calculated. Moreover, a comparison was made between the calculated dosimetric parameters for the HDR sources simulated in this study. We used the MCN-PX to investigate the dosimetric parameters of both sources. The geometry of each source was defined in the input program of MCNPX, and each simulation was performed with an appropriate number of particle histories to get an acceptable Type A statistical uncertainty. The results obtained were tabulated and presented in graphical format; these results show a good agreement with other previous studies. The comparison made between the two simulated sources in this work shows a minor difference observed in the generated 2D along & away tables for complementing the commissioning of these sources within a TPS. This difference is considered negligible by the clinical specialists.

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Section: Introductionsupporting

confidence: 79%

“…A852 source model. The maximum difference was found to be within 1.51% compared with D. Granero et al, (2008) [7] and 0.50% if the comparison is made with Belousov et al, (2014) [8].…”

Section: Resultsmentioning

confidence: 86%

Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Elboukhari¹,

Yamni²,

Ouabi³

et al. 2022

Dosimetry

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“…The first type is characterized by a gradually increasing radial dose function which reaches its maximum at the distance of 1 cm from the source; whereas the second type is characterized by a dose decrease with distance at small values of r. Among the type one sources are BEBIG GI192M11, Flexisource, Gammamed 12i, Gammamed plus, Microselectron V1 and V2, SPEC M19, Vari Source classic and Vary Source VS200; the type two sources are BEBIG Ir2.A95-2 and Buchler G0814. Values of the radial dose functions for source BEBIG Ir2.A95-2 were obtained by the authors [6], and taken from publication [7]; data for all other sources is taken from the database of Carleton University [8]. In all cases, the nonlinear least-squares fitting was performed using OriginPro software.…”

Section: Methodsmentioning

confidence: 99%

“…All expressions are compiled in such a way that the number of fitting parameters a 0 , a 1 ,.., would not exceed 7. In this research, we calculated the radial dose function for source BEBIGIr2.A95-2, performed fitting by formulas (1) and (4)(5)(6) for this source and 10 other sources with 192 Ir used as a radionuclide, as well as performed fitting by a sixth order polynomial and Gaussian function.…”

Section: Introductionmentioning

confidence: 99%

Fitting of Radial Dose Function for 192ir Brachytherapy Sources

Belousov

Bliznyuk²,

Belyanov³

et al. 2018

BJSTR

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This article presents an improved configuration for fitting the radial dose functions of sealed 192Ir brachytherapy sources. The proposed functions allow for precise fitting of radial dose function in the range of 0.5 20 cm. The maximum deviations between fitting data and Monte Carlo modeling data do not exceed 0.6%, while average deviations are in the order of 0.1%. The fitting coefficients for the proposed functions are specified for 11 sources from different manufacturers. The proposed functions could be used in treatment planning systems for more accurate calculation of the dose distributions around the sources using a wide range of data according to TG-43 dosimetry protocol.

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“…[5] The MCNP code is a standard method for brachytherapy recommended by TG-43 U1 and it is widely used to estimate its parameters. [4,6,7] In this work, the dose-rate constant, air-kerma strength and radial dose function were evaluated with Monte Carlo simulations for this new Iodine-125 brachytherapy source developed in Brazil, as a part of a larger project that will include experimental measurements in the future for data comparison.…”

Section: Introductionmentioning

confidence: 99%

Dose-rate constant and air-kerma strength evaluation of a new 125I brachytherapy source using Monte Carlo

Primo

2021

Braz. J. Rad. Sci.

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Brachytherapy is a modality of radiotherapy which treats tumors using ionizing radiation with sources located close to the tumor. The sources can be produced from several radionuclides in various formats, such as Iodine‑125 seeds and Iridium‑192 wires. In order to produce a new Iodine‑125 seed in IPEN/CNEN and ensure its quality, it is essential to describe the dosimetry of the seed, so when applied in a treatment the lowest possible dose to neighboring healthy tissues can be reached. The report by the AAPM’s Task Group 43 U1 is a document that indicates the dosimetry procedures in brachytherapy based on physical and geometrical parameters. In this study, dose-rate constant and air-kerma strength parameters were simulated using the Monte Carlo method radiation transport code MCNP4C. The air-kerma strength is obtained from an ideal modeled seed, since its actual value should be measured for seeds individually in a specialized lab with a Wide-Angle Free-Air Chamber (WAFAC). Dose-rate constant and air-kerma strength are parameters that depends on intrinsic characteristics of the source, i.e. geometry, radionuclide, encapsulation, and together they define the dose-rate to the reference point, defined as the dose-rate to a point 1 cm away from the geometric center of the source, in its transverse plane. This study presents the values found for these parameters with associated statistical uncertainty, and is part of a larger project that aims the full dosimetry of this new seed model, including experimental measures.

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Monte Carlo calculation of dosimetry parameters for a brachytherapy source

Cited by 5 publications

References 18 publications

Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Fitting of Radial Dose Function for 192ir Brachytherapy Sources

Dose-rate constant and air-kerma strength evaluation of a new 125I brachytherapy source using Monte Carlo

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Monte Carlo calculation of dosimetry parameters for a brachytherapy source

Cited by 5 publications

References 18 publications

Comparative Dosimetric Study between 60Co and 192Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Comparative Dosimetric Study between 60Co and 192Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Fitting of Radial Dose Function for 192ir Brachytherapy Sources

Dose-rate constant and air-kerma strength evaluation of a new 125I brachytherapy source using Monte Carlo

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Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended

Comparative Dosimetric Study between ⁶⁰Co and ¹⁹²Ir BEBIG High Dose Rate Sources, Used in Brachytherapy, Using Monte Carlo N-Particle Extended