Validation of total skin electron irradiation (TSEI) technique dosimetry data by Monte Carlo simulation

Nevelsky, A.; Borzov, E.; Daniel, Shahar; Bar-Deroma, R.

doi:10.1120/jacmp.v17i4.6230

Cited by 7 publications

(4 citation statements)

References 13 publications

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“…Compared with the papers of Schiapparelli et al [1] and Nevelesky et al [19] , the results can be confirmed in the proposed treatment methodology. We also concluded that the horizontal gantry angles should have an offset of ±19° to assure a homogenous coverage at the distance of 3.30 m required for our setup.…”

Section: Discussionsupporting

confidence: 73%

Dosimetry, Optimization and FMEA of Total Skin Electron Irradiation (TSEI)

Shariff

Stillkrieg

Lotter

et al. 2022

Zeitschrift für Medizinische Physik

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Section: Discussionsupporting

confidence: 73%

Dosimetry, Optimization and FMEA of Total Skin Electron Irradiation (TSEI)

Shariff

Stillkrieg

Lotter

et al. 2022

Zeitschrift für Medizinische Physik

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“…Details of our linac simulation have been described preciously . Briefly, the incident electron beam parameters (energy spectrum, FWHM, mean angular spread) were adjusted first to match the measured data (PDD and profile) at SSD = 100 cm for an open field.…”

Section: Methodsmentioning

confidence: 99%

EP-1579: Room scatter effects in Total Skin Electron Therapy: a Monte Carlo study

Nevelsky¹,

Borzov²,

Daniel³

et al. 2016

Radiotherapy and Oncology

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Telephone: (972) 4 7772015; Fax: (972) 4 7773154. AbstractPurpose: Total Skin Electron Irradiation (TSEI) is a complex technique which usually involves the use of large electron fields and the dual-field approach. In this situation, many electrons scattered from the treatment room floor are produced. However, no investigations of the effect of scattered electrons in TSEI treatments have been reported. The purpose of this work was to study the contribution of floor scattered electrons to skin dose during TSEI treatment using Monte Carlo (MC) simulations.Methods: All MC simulations were performed with the EGSnrc code. Influence of beam energy, dual-field angle, and floor material on the contribution of floor scatter was investigated. Spectrum of the scattered electrons was calculated. Measurements of dose profile were performed in order to verify MC calculations.Results: Floor scatter dependency on the floor material was observed (at 20 cm from the floor, scatter contribution was about 21%, 18%, 15%, and 12% for iron, concrete, PVC, and water, respectively). Although total dose profiles exhibited slight variation as functions of beam energy and dual-field angle, no dependence of the floor scatter contribution on the beam energy or dual-field angle was found. The spectrum of the scattered electrons was almost uniform between a few hundred KeV to 4 MeV, and then decreased linearly to 6 MeV.Conclusions: For the TSEI technique, dose contribution due to the electrons scattered from the room floor may be clinically significant and should be taken into account during design and commissioning phases. MC calculations can be used for this task.

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“…and six dual fields (Stanford technique) were evaluated. Nevelesky et al [11] simulated a full TSEI treatment in an anthropomorphic phantom by the Monte Carlo method and validated the measured dosimetry data by the Monte Carlo (MC) simulations thanks to EGSnrc-based codes (BEAMnrc and DOSXYZnrc). The BEAMnrc code has high precision in the simulation of the material and electron radiation fields [12,13].…”

Section: Jinst 13 P05029mentioning

confidence: 99%

“…DOSXYZnrc [15] simulates the transport of photons and electrons in a Cartesian volume and scores the energy deposition in the designated voxels. The output of DOSXYZnrc calculations is a file that stores the calculated 3D dose distribution data and the corresponding dose uncertainties [11].…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

Monte Carlo study and design of system for implementation of Rotational Total Skin Electron Irradiation technique

et al. 2018

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A: Total skin electron irradiation technique is used in treatment of the mycosis fungoid. The implementation of this technique requires non-standard measurements and complex dosimetry methods. Depending on the linear accelerator (Linac) type, bunker size, room dimensions and dosimetry equipment, the design of instruments for appropriate set up and implementation of TSEI in different radiation therapy centers varies.The studies which have been done in this article provide an introduction to the implementing of this method for the first time in Iran and its results can be used for the centers with similar specifications in the world. This article determined the electron beam characteristic of TSEI for the only electron accelerator, located at the radiation center of the Seyed Alshohada Hospital of Isfahan (NEPTUN 10PC), by performing Monte Carlo simulations and using EGSnrc-based codes (BEAMnrc and DOSXYZnrc). For the best uniformity of the vertical profile, the optimal angle of gantry was defined at SSD=350 cm. The effect of the degrader plane that is located at a distance of 20 cm from the patient surface, was evaluated on the amount of energy reduction of the beam, the opening of the electron beam field and the homogeneity of the dose distribution. The transversal dose distribution from the whole treatment with Stanford technique (six dual fields) and Rotational technique was simulated in a CT-based anthropomorphic phantom. Also, the percentage depth dose in the head, neck, thorax, abdomen and legs was obtained for both methods. The simulation results show that the 20 • angle between the horizontal and the beam central axis is optimal in order to provide the best vertical dose uniformity. The mean energy decreases from 6.1 MeV (the exit window) to 3 MeV (the treatment surface) by placing a degrader with 0.8 cm thickness in front of the treatment plane. FWHM of the angular distribution of the electron beam increased from 15 • at SSD=100 cm to more than 30 • on the treatment surface by traversing the PMMA degrader. The MC calculated percentage depth dose curves in different organs of anthropomorphic phantom for RTSEI indicates that the depth of maximum dose is on the surface of the phantom and Isodose curve of 80% is formed at a depth less than 4 mm. the results also show, with the degrader plane in front of the patient, the degree of homogeneity of the dose distribution for both Stanford and rotational techniques is the same. K: Algorithms and Software for radiotherapy; Instrumentation for gamma-electron therapy; Radiotherapy concepts

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Validation of total skin electron irradiation (TSEI) technique dosimetry data by Monte Carlo simulation

Cited by 7 publications

References 13 publications

Dosimetry, Optimization and FMEA of Total Skin Electron Irradiation (TSEI)

Dosimetry, Optimization and FMEA of Total Skin Electron Irradiation (TSEI)

EP-1579: Room scatter effects in Total Skin Electron Therapy: a Monte Carlo study

Monte Carlo study and design of system for implementation of Rotational Total Skin Electron Irradiation technique

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