Proton Dosimetry Using Radiation-Induced Luminescence in Micrometer-Core Germanosilicate Optical Fibers

Bélanger-Champagne, C.; Fricano, Fiammetta; Morana, Adriana; Lambert, Damien; Penner, Crystal; Paillet, Philippe; Trinczek, M.; Usherovich, Samuel; Girard, Sylvain; Hoehr, Cornelia

doi:10.1109/tns.2023.3243565

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…Many scintillation dosimeters are fabricated using plastic or silica optical fibres as transport fibres and organic or inorganic scintillators for radiation sensing [31][32][33][34][35][36][37]. When irradiated, scintillator atoms (inorganic scintillators) or molecules (organic scintillators) are excited, and as the product of the scintillator returning to a neutral state, light is emitted and radiation-induced luminescence (RIL) is detected.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Point Optical Fibre Sensor for Proton Therapy

Penner,

Usherovich,

Andru

et al. 2024

Electronics

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As the technology to deliver precise and very high radiotherapeutic doses with narrow margins grows to better serve patients with complex radiotherapeutic needs, so does the need for sensors and sensor systems that can reliably deliver multi-point dose monitoring and dosimetry for enhanced safety and access. To address this need, we investigated a novel five-point scintillator system for simultaneously sampling points across a 74 MeV proton beam with a Hamamatsu 16-channel MPPC array. We studied the response across beam widths from 25 mm down to 5 mm in diameter and in multiple depths to observe beam penumbrae and output factors as well as depth–dose. We found through comparison to ionization chambers and radiochromic film that the array is capable of measurements accurate to within 8% in the centre of proton beams from 5 to 25 mm in diameter, and within 2% at 3.5 cm depth in water. The results from three trials are repeatable after calibration to within <1%. Overall, the five optical fibre sensor system shows promise as a fast, multipoint relative dosimetry system.

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Section: Introductionmentioning

confidence: 99%

A Multi-Point Optical Fibre Sensor for Proton Therapy

Penner,

Usherovich,

Andru

et al. 2024

Electronics

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Very High Dose Rate Proton Dosimetry With Radioluminescent Silica-Based Optical Fibers

Fricano,

Morana,

Lambert

et al. 2024

IEEE Trans. Nucl. Sci.

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Multi-Point Sensing via Organic Optical Fibres for FLASH Proton Therapy

Penner,

Usherovich,

Andru

et al. 2024

Electronics

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Optical fibres are gaining popularity for relative dosimetry in proton therapy due to their spatial resolution and ability for near real-time acquisition. For FLASH proton therapy, these fibres need to handle higher dose rates and larger doses than for conventional proton dose rates. We developed a multi-point fibre sensor embedded in a 3D-printed phantom which can measure the profile of a FLASH proton beam. Seven PMMA fibres of 1 mm diameter were embedded in a custom 3D-printed plastic phantom of the same density as the fibres. The phantom was placed in a proton beam with FLASH dose rates at the TRIUMF Proton Therapy Research Centre (PTRC). The sensor was exposed to different proton energies, 13.5 MeV, 19 MeV and 40.4 MeV, achieved by adding PMMA bolus in front of the phantom and three different beam currents, varying the dose rates from 7.5 to 101 Gy/s. The array was able to record beam profiles in both transverse and axial directions in relative agreement with measurements from EBT-XD radiochromic films (transverse) and Monte Carlo simulations (axial). A decrease in light output over time was observed, which might be caused by radiation damage in the matrix of the fibre and characterised by an exponential decay function.

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Proton Dosimetry Using Radiation-Induced Luminescence in Micrometer-Core Germanosilicate Optical Fibers

Cited by 3 publications

References 22 publications

A Multi-Point Optical Fibre Sensor for Proton Therapy

A Multi-Point Optical Fibre Sensor for Proton Therapy

Very High Dose Rate Proton Dosimetry With Radioluminescent Silica-Based Optical Fibers

Multi-Point Sensing via Organic Optical Fibres for FLASH Proton Therapy

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