Radiotherapy out-of-field dosimetry: Experimental and computational results for photons in a water tank

Bordy, Jean-Marc; Bessiéres, I.; D’Agostino, Emiliano; Domingo, C.; D’Errico, Francesco; Fulvio, Angela Di; Knežević, Željka; Miljanić, Saveta; Olko, P.; Ostrowsky, A.; Poumarède, Bénédicte; Sorel, S.; Stolarczyk, Liliana; Vermesse, D.

doi:10.1016/j.radmeas.2013.06.010

Cited by 36 publications

(27 citation statements)

References 8 publications

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“…As these spectrum variations are unknown, it is difficult to properly evaluate the out-of-field dose uncertainty. A work from Bordy et al [91] estimated the uncertainty for out-of-field measurements by optically stimulated luminescence detectors (OSL) by looking at all the sources of uncertainty and combining them in a model following the guide to the expression of uncertainty in measurement (GUM). They estimated a maximum uncertainty of 4.5% (1 sigma).…”

Section: Estimation Of the Dose At The Point Or Volume Of Interestmentioning

confidence: 99%

A review of uncertainties in radiotherapy dose reconstruction and their impacts on dose–response relationships

et al. 2017

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Proper understanding of the risk of radiation-induced late effects for patients receiving external photon beam radiotherapy requires the determination of reliable dose–response relationships. Although significant efforts have been devoted to improving dose estimates for the study of late effects, the most often questioned explanatory variable is still the dose. In this work, based on a literature review, we provide an in-depth description of the radiotherapy dose reconstruction process for the study of late effects. In particular, we focus on the identification of the main sources of dose uncertainty involved in this process and summarise their impacts on the dose–response relationship for radiotherapy late effects. We provide a number of recommendations for making progress in estimating the uncertainties in current studies of radiotherapy late effects and reducing these uncertainties in future studies.

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Section: Estimation Of the Dose At The Point Or Volume Of Interestmentioning

confidence: 99%

A review of uncertainties in radiotherapy dose reconstruction and their impacts on dose–response relationships

et al. 2017

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“…1 These experiments were specifically designed to yield dosimetric data that was needed to understand and model the physics of stray radiation exposure. The measurement methods and a limited number of preliminary results were previously reported by Bordy et al 28 The EURADOS dataset consists of measurements made with multiple types thermoluminescent dosimeters (TLDs), radiophotoluminescent dosimeters (RPLs), and optically stimulated luminescent dosimeters (OSLDs) of doses delivered by a Saturne 43 linac (GE Medical Systems, USA). The calibration procedure for the various types of dosimeters is described by Kne zevi c et al 29 Doses were measured at various locations inside a 30 9 30 9 60 cm 3 water phantom.…”

Section: B Measurementsmentioning

confidence: 99%

A descriptive and broadly applicable model of therapeutic and stray absorbed dose from 6 to 25 MV photon beams

et al. 2017

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“…With the obtained results, the irradiated mass was estimated and a better agreement on RE of 0.7%-8% was observed despite of the uncertainties 11 . It was concluded that the absorbed dose delivered by low photon energy is not accurately known 11 On the other hand, outside of radiotherapy fields where low photon energy spectra exist 16,17 discrepancies are commonly observed on the absorbed dose measured with different dosimeters [18][19][20] . This can be associated to two possible phenomena: a lack of information about the electron interaction at low energy and/or the limited understanding about the relationship between the absorbed dose and the dosimeter's response.…”

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confidence: 99%

Future Directions on Low-Energy Radiation Dosimetry

Massillon‐JL

2021

Preprint

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For more than one century, low-energy (< 100 keV) photons (x-rays and gamma) have been widely used in different areas including biomedical research and medical applications such as mammography, fluoroscopy, general radiography, computed tomography, and brachytherapy treatment, amongst others. It has been demonstrated that most of the electrons produced by low photon energy beams have energies below 10 keV. However, the physical processes by which these low energy electrons interact with matter are not yet well understood. Besides, it is generally assumed that all the energy deposited within a dosimeter sensitive volume is transformed into a response. But such an assumption could be incorrect since part of the energy deposited might be used to create defects or damages at the molecular and atomic level. Consequently, the relationship between absorbed dose and dosimeter response can be mistaken. During the last few years, efforts have been made to identify models that allow to understand these interaction processes from a quantum mechanical point of view. Some approaches are based on electron-beam − solid-state-interaction models to calculate electron scattering cross-sections while others consider the density functional theory method to localize low energy electrons and evaluate the energy loss due to the creations of defects and damages in matter. The results obtained so far could be considered as a starting point. This paper presents some methodologies based on fundamental quantum mechanics which can be considered useful for dealing with low-energy interactions.

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Radiotherapy out-of-field dosimetry: Experimental and computational results for photons in a water tank

Cited by 36 publications

References 8 publications

A review of uncertainties in radiotherapy dose reconstruction and their impacts on dose–response relationships

A review of uncertainties in radiotherapy dose reconstruction and their impacts on dose–response relationships

A descriptive and broadly applicable model of therapeutic and stray absorbed dose from 6 to 25 MV photon beams

Future Directions on Low-Energy Radiation Dosimetry

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