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Dosimetric characterization of an inorganic optical fiber sensor for external beam radiation therapy

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dc.contributor.author Alharbi, Majed
dc.contributor.author Gillespie, Sean
dc.contributor.author Woulfe, Peter
dc.contributor.author McCavana, Pat
dc.contributor.author O'Keeffe, Sinéad
dc.contributor.author Foley, Mark
dc.date.accessioned 2019-01-03T15:33:30Z
dc.date.available 2019-01-03T15:33:30Z
dc.date.issued 2018
dc.identifier.uri http://hdl.handle.net/10344/7443
dc.description peer-reviewed en_US
dc.description.abstract The aim of this study was to investigate the dosimetric performance of a novel optical fiber sensor for use in external beam radiation therapy. Repeatability and reproducibility of the output signal, linearity, dose rate and dose per pulse dependence were evaluated. Angular dependence was investigated in the axial and azimuthal planes. The percentage depth dose and lateral dose profiles were measured using the optical fiber sensor system and compared to commercially available detectors such as Exradin W1 plastic scintillator and a PTW-microdiamond detector. The result of this study show that the optical fiber sensor system has good repeatability and reproducibility of the output signal with a maximum deviation of 0.17% and 1.00%, respectively. The system also showed an excellent linearity with dose, and its signal was independent of dose rate. However, the systemshowed a strong dependence on dose per pulse with 27% deviation from the W1 result at the highest dose per pulse value that was achieved at 75 cm source to surface distance. The system also showed an angular dependence when the incident beam was in the azimuthal plane due to the geometry of the scintillator at the tip of the fiber. The optical fiber sensor over-responded when measuring percentage depth dose curves and lateral dose profiles due in part to the sensitivity of the scintillating material (Gd2O2S:Tb) to low energy scattered radiation. However, further investigation is needed to quantify the overall contribution of Cerenkov radiation to the over-response of the optical fiber sensor. en_US
dc.language.iso eng en_US
dc.publisher IEEE Computer Society en_US
dc.relation SFI en_US
dc.relation.ispartofseries IEEE Sensors Journal; 19 (6), pp. 2140-2147
dc.relation.uri http://dx.doi.org/10.1109/JSEN.2018.2885409
dc.rights © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. en_US
dc.subject external beam radiation therapy en_US
dc.subject inorganic optical fiber sensor en_US
dc.subject radiation dosimetry en_US
dc.title Dosimetric characterization of an inorganic optical fiber sensor for external beam radiation therapy en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1109/JSEN.2018.2885409
dc.contributor.sponsor SFI en_US
dc.relation.projectid UF150618 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US


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