The paper reports on the first demonstration of in-situ, real-time dosimetry realized with an enhanced back-scattering optical fiber and a high-resolution optical back-scattering reflectometry measurement. This work is devised to overcome the current problems in monitoring radiotherapy treatments, in particular the difficult evaluation of not only the actual x-ray dose that is accumulated on the target volume, but also the distribution profile of the ionizing radiation beam. The experiments have been conducted by evaluating the radiation-induced spectral shift of the Rayleigh back-scattering along the fiber under test during x-ray exposure, in a radiation chamber. The sensing region is a section of aluminum-doped silicate fiber, that overcomes the poor sensitivity to radiation of standard, germanium-doped, silicate fibers for telecom applications. The preliminary results show that it is possible to remotely track the x-ray dose at high dose rates (700 Gy/min) and at rates closer to therapeutic values (22 Gy/min). A linear relationship between accumulated dose and spectral shift has been found. This research aims at developing a dose sensor with the most demanding features of small form factor, spatial profiling and remote interrogation.

Preliminary investigation of radiation dose sensors based on aluminum-doped silicate optical fibers / Olivero, Massimo; Mirigaldi, Alessandro; Serafini, Valentina; Blanc, Wilfried; Benabdesselam, Mourad; Mady, Franck; Molardi, Carlo; Tosi, Daniele; Vallan, Alberto; Perrone, Guido. - ELETTRONICO. - (2020). ((Intervento presentato al convegno 2020 IEEE International Symposium on Medical Measurements and Applications (MeMeA) tenutosi a Bari (Italy) - Virtual nel June, 1st-3rd, 2020 [10.1109/MeMeA49120.2020.9137331].

Preliminary investigation of radiation dose sensors based on aluminum-doped silicate optical fibers

Olivero, Massimo;Mirigaldi, Alessandro;Serafini, Valentina;Tosi, Daniele;Vallan, Alberto;Perrone, Guido
2020

Abstract

The paper reports on the first demonstration of in-situ, real-time dosimetry realized with an enhanced back-scattering optical fiber and a high-resolution optical back-scattering reflectometry measurement. This work is devised to overcome the current problems in monitoring radiotherapy treatments, in particular the difficult evaluation of not only the actual x-ray dose that is accumulated on the target volume, but also the distribution profile of the ionizing radiation beam. The experiments have been conducted by evaluating the radiation-induced spectral shift of the Rayleigh back-scattering along the fiber under test during x-ray exposure, in a radiation chamber. The sensing region is a section of aluminum-doped silicate fiber, that overcomes the poor sensitivity to radiation of standard, germanium-doped, silicate fibers for telecom applications. The preliminary results show that it is possible to remotely track the x-ray dose at high dose rates (700 Gy/min) and at rates closer to therapeutic values (22 Gy/min). A linear relationship between accumulated dose and spectral shift has been found. This research aims at developing a dose sensor with the most demanding features of small form factor, spatial profiling and remote interrogation.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2834534