Modulated electron radiotherapy treatment planning using a photon multileaf collimator for post-mastectomized chest walls

Salguero, Francisco J.; Palma, Bianey; Arráns, R.; Roselló, J.; Leal, Antonio

doi:10.1016/j.radonc.2009.08.021

Cited by 42 publications

(49 citation statements)

References 33 publications

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“…In addition to evaluating the differences in beam quality between Varian machines, such a comparison would be useful for the development of Monte Carlo electron beam models used for accurate dose calculations. While Varian has recently released phase‐space source files for each of the electron energies available on the TrueBeam, (4) such models are useful for continued research into treatment techniques involving modulated electron fields (MERT) (5) …”

Section: Introductionmentioning

confidence: 99%

Comparison of measured Varian Clinac 21EX and TrueBeam accelerator electron field characteristics

Lloyd

Zavgorodni

Gagne

2015

J Applied Clin Med Phys

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Dosimetric comparisons of radiation fields produced by Varian's newest linear accelerator, the TrueBeam, with those produced by older Varian accelerators are of interest from both practical and research standpoints. While photon fields have been compared in the literature, similar comparisons of electron fields have not yet been reported. In this work, electron fields produced by the TrueBeam are compared with those produced by Varian's Clinac 21EX accelerator. Diode measurements were taken of fields shaped with electron applicators and delivered at 100 cm SSD, as well as those shaped with photon MLCs without applicators and delivered at 70 cm SSD for field sizes ranging from 5×5 to 25×25 cm2 at energies between 6 and 20 MeV. Additionally, EBT2 and EBT3 radio‐chromic film measurements were taken of an MLC‐shaped aperture with closed leaf pairs delivered at 70 cm SSD using 6 and 20 MeV electrons. The 6 MeV fields produced by the TrueBeam and Clinac 21EX were found to be almost indistinguishable. At higher energies, TrueBeam fields shaped by electron applicators were generally flatter and had less photon contamination compared to the Clinac 21EX. Differences in PDDs and profiles fell within 3% and 3 mm for the majority of measurements. The most notable differences for open fields occurred in the profile shoulders for the largest applicator field sizes. In these cases, the TrueBeam and Clinac 21EX data differed by as much as 8%. Our data indicate that an accurate electron beam model of the Clinac 21EX could be used as a starting point to simulate electron fields that are dosimetrically equivalent to those produced by the TrueBeam. Given that the Clinac 21EX shares head geometry with Varian's iX, Trilogy, and Novalis TX accelerators, our findings should also be applicable to these machines.PACS number: 87.56.bd

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Section: Introductionmentioning

confidence: 99%

Comparison of measured Varian Clinac 21EX and TrueBeam accelerator electron field characteristics

Lloyd

Zavgorodni

Gagne

2015

J Applied Clin Med Phys

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“…Pour améliorer les résultats en termes de tolérance, certaines équipes ont proposé une alternance hebdomadaire des faisceaux de photons et d'électrons, mais on assiste actuellement à une révolution des techniques utilisées en fonction de l'indication (après mastectomie, avec ou sans implant, ou après traitement conservateur) mettant en oeuvre des techniques d'irradiation conformationnelle avec modulation d'intensité de la dose délivrée par photons [20][21][22][23] ou électrons [24,25].…”

Section: Faisceaux Tangentiel Et Mammaire Interne Séparésunclassified

État de l’art de l’irradiation des ganglions de la chaîne mammaire interne

Kirova

Almeida

Fournier-Bidoz

2015

Cancer/Radiothérapie

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“…This working mode already proved good results for complex situations, in which was not possible to use the conventional planning systems, such as the case of using mixed electron and photon modulated beams for breast cancer. 33,34 In this work we present the second mode, which is based on direct apertures initially generated for each field incidence by means of the sequencing of a matrix composed by mass thickness values, clinical structures of interest and/or image intensities of PET. This matrix, henceforth "biophysical map," or BM is a combination of all information according to certain criteria managed by means of the Biomap algorithm, which will be described later.…”

Section: A Carmen System Algorithmmentioning

confidence: 99%

“…These PSDs were used as source for dose calculation by means of a modified version of DOSXYZnrc, 38 named BEAMDOSE. 33 This modification allows knowing every aperture contribution to each voxel in order to score the beamlet dose contribution (BDC) for weighting optimization purpose. For each modeled linac a conversion factor from MC dose to Monitor Units has been calculated by means of experimental measurements.…”

Section: A2 Monte Carlo Simulation Of Apertures and Dose Calculationmentioning

confidence: 99%

MCTP system model based on linear programming optimization of apertures obtained from sequencing patient image data maps

et al. 2014

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Modulated electron radiotherapy treatment planning using a photon multileaf collimator for post-mastectomized chest walls

Cited by 42 publications

References 33 publications

Comparison of measured Varian Clinac 21EX and TrueBeam accelerator electron field characteristics

Comparison of measured Varian Clinac 21EX and TrueBeam accelerator electron field characteristics

État de l’art de l’irradiation des ganglions de la chaîne mammaire interne

MCTP system model based on linear programming optimization of apertures obtained from sequencing patient image data maps

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