A Novel Multi-Headed Scintillation Detector for Fast and Efficient Dose Measurements at Multiple Locations Simultaneously

Advanced Optical Dosimetry, Fundamental research, MV Photon, Advanced Optical Dosimetry, Multi-point, Real-time Dosimetry Show more

To develop and quantify the performances of a novel multi-point scintillation detector having multiple heads connected to the same optical line, allowing real-time dose measurements simultaneously at 3 positions in non-contiguous space.

2022 AAPM ANNUAL MEETING
B.Lessard (1,2), Y.Lechasseur (3), S.Lambert-girard (3), F.Therriault-Proulx (3), L.Beaulieu (1,2), L.Archambault (1,2) | 1- Département de physique, génie physique et optique, et Centre de recherche sur le cancer, Université Laval, Québec, CA , 2- CHU de Quebec – Universite Laval, QC, Canada, 3- MEDSCINT, QC, Canada

Characterization of an x‐ray tube‐based ultrahigh dose‐rate system for in vitro irradiations.

FLASH-RT, kV Photon, Rabiobiology, Real-time Dosimetry Show more

To present an x-ray tube system capable of in vitro ultrahigh dose-rate (UHDR) irradiation of small < 0.3 mm samples and to characterize it by means of a plastic scintillation detector (PSD).

Med Phys. 2021
D.Cecchi (1), F.Therriault-Proulx (2), S.Lambert-girard (2), A.Hart (1), A.Macdonald (1), M.Pfleger (1), M.Lenckowski (1), M.Bazalova-Carter (1) | Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia, Canada, MedScint, QC, CA

Pre-Clinical and Clinical Evaluation of the HYPERSCINT Scintillation Dosimetry Research Platform

In Vivo Dosimetry, MV Photon, Commissioning, Quality Assurance, Real-time Dosimetry Show more

The purpose of this work is to evaluate the HYPERSCINT scintillation dosimetry research platform (Medscint Inc., Quebec City, Canada) designed for clinical QA for use in in-vivo dosimetry measurements.

2020 AAPM AM
I.Schoepper, E.Trestrail, S.Dieterich, M.Kent | WR Pritchard Veterinary Medical Teaching Hospital, UC Davis School of Veterinary Medicine UC Davis School Of Veterinary Medicine, Pacific Crest Medical Physics ,Chico, CA, UC Davis Medical Center, Sacramento, CA, Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA

Evaluation of scintillation detectors for ultrahigh dose-rate x-ray beam dosimetry

FLASH-RT, In Vivo Dosimetry, kV Photon, Advanced Optical Dosimetry, Detector comparaison, Fundamental Research, Real-time Dosimetry Show more

FLASH-Radiotherapy is an emerging ultrahigh dose rates radiotherapy technique, and animal studies have demonstrated the safety and efficacy of the technique in cancer treatment. A reliable real-time dosimeter system is crucial for the characterization of the so-called ‘FLASH-effect’, and an accurate beam delivery. This study aims to benchmark the performance of optical fiber inorganic scintillating detectors (ISDs) with plastic scintillating detectors (PSDs) for an ultrahigh dose-rate x-ray beam irradiation. Measurements includes : relative scintillator output, signal linearity with dose and dose rate, signal-to-noise ratio (SNR), signal stability and reliability.

The PSDs resulted in the highest reliability for a UHDR beam measurement with a CV of <0.1% while the Gd2O2S:Tb showed excellent repeatability (coefficient of variation (CV) <0.1%) compared to other detectors. All detectors showed good linearity with tube current (R2 < 0.975) and shutter exposure (R2 >0.999).

Proc Spie
Shahirah Shaharuddin (1), Alexander Hart (2), Magdalena Bazalova-Carter (2), Luc Beaulieu (3), Cloe Giguere (3), Christoph Kleefeld (1), Mark J. Foley (1) | 1. National University of Ireland, Galway (Ireland), 2. University of Victoria (Canada), 3 University Laval (Canada)

Deformable Scintillation Dosimeter: II. Real-Time Simultaneous Measurements of Dose and Tracking of Deformation Vector Fields

Advanced Optical Dosimetry, MV Photon, Custom Probe Development, Multi-point, Real-time Dosimetry Show more

This article introduces a novel deformable dosimeter that can measure the dose distribution and track the deformation of a material during radiotherapy treatments using the HYPERSCINT dosimetry system. The dosimeter is made of an array of 19 scintillating fiber detectors embedded in a cylindrical elastomer matrix. It is imaged by two pairs of stereoscopic cameras that record the position, angulation and dose of the scintillators.

Physics in Medicine & Biology
Emily Cloutier (1,2), Luc Beaulieu(1,2), Louis Archambault (1,2) | 1. Service de physique médicale et Axe Oncologie du Centre de recherche, CHU de Québec-Université Laval, Canada, 2. Département de physique, de génie physique et d’optique, et Centre de recherche sur le cancer, Université Laval, Québec, Canada

Real-time dosimetry of ultrahigh dose-rate x-ray beams using scintillation detectors

Advanced Optical Dosimetry, FLASH-RT, Fundamental research, In Vivo Dosimetry, kV Photon, Advanced Optical Dosimetry, Custom Probe Development, Detector comparaison, Fundamental Research, Real-time Dosimetry Show more

FLASH radiation therapy using an ultrahigh dose-rate beam is found to eradicate tumours whilst significantly reducing radiation-induced tissue toxicity. A real-time dosimetry system is required for the technique to be implemented clinically and for further preclinical studies. This study aimed to optimize the design of scintillating detectors using inorganic materials for real-time dosimetry in ultrahigh dose-rate radiation applications. Inorganic scintillator detectors were fabricated using phosphor-based scintillating materials (Gd2O2S:Tb, La2O2S:Tb, and La2O2S:Eu) coupled with optical fibers. The initial results in ultrahigh dose-rate x-ray irradiation showed excellent linearity with signal independent of the dose rate and dose delivered. A hyperspectral approach is adopted in this study to account for the stem effect that occurs within the high energy typically used in radiotherapy.

IEEE
Shahirah Shaharuddin (1), Alexander Hart (2), Daniel D. Cecchi (2), Magdalena Bazalova-Carter (2), Mark Foley (1) | 1. School of Physics, National University of Ireland Galway, Ireland, 2. Department of Physics & Astronomy, University of Victoria, Canada