Monte Carlo-based determination of radiation leakage dose around a dedicated IOERT accelerator

Baghani, Hamid Reza; Aghdam, Seyed Rashid Hosseini; Robatjazi, Mostafa; Mahdavi, Seyed Rabi

doi:10.1007/s00411-019-00786-1

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…MCNPX (version 2.6) was used in the current study for simulating the intraoperative electron irradiations and relevant photon contamination beneath the studied shielding disks 25,26 . In this regard, A Validated Monte Carlo‐simulated Model of Liac12 head at different intraoperative electron energies was employed 27 . The simulated modules respectively included a Titanium (Ti) exit window, Al scattering foil, air‐filled monitor ion chambers, a Mylar‐made protective layer, sidelong PEEK and PMMA polymer support, and a cylindrical PMMA‐based applicator.…”

Section: Methodsmentioning

confidence: 99%

“…25,26 In this regard, A Validated Monte Carlo-simulated Model of Liac12 head at different intraoperative electron energies was employed. 27 The simulated modules respectively included a Titanium (Ti) exit window, Al scattering foil, air-filled monitor ion chambers, a Mylar-made protective layer, sidelong PEEK and PMMA polymer support, and a cylindrical PMMA-based applicator. The initial electron energy spectra and their spatial distribution upon the exit window were provided by the manufacturer (Sordina, SpA, Italy).…”

Section: Dedicated Ioert Acceleratormentioning

confidence: 99%

“…The validity of the employed Monte Carlo model of the Liac12 head at different nominal electron energies has been confirmed through comparing the relevant PDD (percentage depth dose) and TDP (transverse dose profiles) data with those practically measured through ionometric dosimetry inside a water phantom. 27…”

Section: Dedicated Ioert Acceleratormentioning

confidence: 99%

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Evaluating the induced photon contamination by different breast IOERT shields using Monte Carlo simulation

Baghani

Robatjazi

2023

J Applied Clin Med Phys

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Background and ObjectiveAvoiding the underlying healthy tissue over‐exposure during breast intraoperative electron radiotherapy (IOERT) is owing to the use of some dedicated radioprotection disks during patient irradiation. The originated contaminant photons from some widely used double‐layered shielding disks including PMMA+Cu, PTFE+steel, and Al+Pb configurations during the breast IOERT have been evaluated through a Monte Carlo (MC) simulation approach.MethodsProduced electron beam with energies of 6, 8, 10, and 12 MeV by a validated MC model of Liac12 dedicated IOERT accelerator was used for disk irradiations. Each of above‐mentioned radioprotection disks was simulated inside a water phantom, so that the upper disk surface was positioned at R90 depth of each considered electron energy. Simulations were performed by MCNPX (version 2.6.0) MC code. Then, the energy spectra of the contaminant photons at different disk surfaces (upper, middle, and lower one) and relevant contaminant dose beneath the studied disks were determined and compared.ResultsNone of studied shielding disks show significant photon contamination up to 10 MeV electron energy, so that the induced photon dose by the contaminant X‐rays was lower than those observed in the disk absence under the same conditions. In return, the induced photon dose at a close distance to the lower disk surface exceeded from calculated values in the disk absence at 12 MeV electron energy. The best performance in contaminant dose reduction at the energy range of 6–10 MeV belonged to the Al+Pb disk, while the PMMA+Cu configuration showed the best performance in this regard at 12 MeV energy.ConclusionFinally, it can be concluded that all studied shielding disks not only don't produce considerable photon contamination but also absorb the originated X‐rays from electron interactions with water at the electron energy range of 6–10 MeV. The only concern is related to 12 MeV energy where the induced photon dose exceeds the dose values in the disk absence. Nevertheless, the administered dose by contaminant photons to underlying healthy tissues remains beneath the tolerance dose level by these organs at the entire range of studied electron energies.

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Section: Methodsmentioning

confidence: 99%

Section: Dedicated Ioert Acceleratormentioning

confidence: 99%

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Evaluating the induced photon contamination by different breast IOERT shields using Monte Carlo simulation

Baghani

Robatjazi

2023

J Applied Clin Med Phys

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“…La interacción de los electrones con los diversos componentes del LINAC conduce a la dispersión de los mismos así como a la producción de fotones secundarios. El impacto de tales partículas en el cuerpo mismo del paciente puede elevar las probabilidades de padecer cáncer, por estas razones conviene conocer y cuantificar este tipo de radiación secundaria [2]. El estudio de la generación de radiación secundaria incluye también la producción de neutrones debida a la aceleración de electrones en LINAC's empleados en radioterapia intraoperatoria (IORT).…”

Section: Introductionunclassified

Estudio de la radiación de fuga generada en el cabezal de un acelerador lineal

Barrios

2021

RevIngUC

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Fueron estudiadas las características de la radiación de fuga de un acelerador lineal. Se ejecutó un proceso de simulación empleando el programa de simulación Montecarlo PENELOPE Ver. 2006, se almacenaron los valores de la energía, la posición y la dirección de las partículas en un archivo de espacio de fases. Fueron seleccionadas las energías 6, 12 y 18 MeV y la fuente de partículas, la lámina dispersora, el filtro, la cámara de ionización y el sistema colimador de wolframio. Para el análisis se empleó estadística inferencial. Los resultados muestran que los ángulos de dispersión asociados a cada componente pueden variar desde 30° hasta 180°, se presentan además las energías medias de las partículas bajo estudio, observándose que en la medida en que aumenta la energía inicial de las partículas aumenta también la producción de electrones y fotones secundarios, se observó que el número de positrones detectados se incrementa al aumentar la energía inicial de los electrones de la fuente y que la lámina dispersora, el filtro y los bloques colimadores son los componentes con mayor capacidad dispersiva. El método permite identificar las principales fuentes de radiación de fuga y las características principales de dicha radiación así como su tipo.

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Dosimetric characteristics of the INTRABEAM ® system with spherical applicators in the presence of air gaps and tissue heterogeneities

Tegaw

Gholami

Omyan

et al. 2020

Radiat Environ Biophys

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Monte Carlo-based determination of radiation leakage dose around a dedicated IOERT accelerator

Cited by 7 publications

References 18 publications

Evaluating the induced photon contamination by different breast IOERT shields using Monte Carlo simulation

Evaluating the induced photon contamination by different breast IOERT shields using Monte Carlo simulation

Estudio de la radiación de fuga generada en el cabezal de un acelerador lineal

Dosimetric characteristics of the INTRABEAM ® system with spherical applicators in the presence of air gaps and tissue heterogeneities

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