On the nature of the light produced within PMMA optical light guides in scintillation fiber-optic dosimetry

9. Advanced Dosimetry, MeV Electron, MV Photon, Advanced Optical Dosimetry, Cherenkov, Energy Dependency, Fundamental Research Show more

The goal of this study was to evaluate the nature of the stem effect light produced within an optical fiber, to quantify its composition, and to evaluate the efficiency of the chromatic technique to remove the stem effect. The chromatic stem effect removal technique is accurate in most of the situations. However, noticeable differences were obtained between very specific high-energy irradiation conditions. It would be advantageous to implement an additional channel in the chromatic stem effect removal chain or implement a spectral approach to independently remove the Cerenkov and the fluorescence components from the signal of interest. This would increase the accuracy and versatility of the actual chromatic stem effect removal technique.

PHYSICS IN MEDICINE & BIOLOGY
F.Therriault-Proulx (1)(2), L.Beaulieu (2)(3), L.Archambault (2)(3), S.Beddar (4)(1) | 1- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA, 2- Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec, Québec, Canada, 3- Département de Radio-Oncologie, Hôtel-Dieu de Québec, Centre Hospitalier Universitaire de Québec, Québec, Canada

Development of a novel multi-point plastic scintillation detector with a single optical transmission line for radiation dose measurement

3. Treatment Plan (End-to-End) QA, 5. In Vivo Dosimetry, 9. Advanced Dosimetry, MV Photon, Fundamental Research, Multi-point Dosimetry, Quality Assurance, Real-time Dosimetry Show more

The goal of this study was to develop a novel multi-point plastic scintillation detector capable of measuring the dose accurately at multiple positions simultaneously using a single optical transmission line. This study demonstrates the practical feasibility of multi-point plastic scintillation detector. This type of detector could be very useful for pre-treatment quality assurance applications as well as an accurate tool for real-time in vivo dosimetry.

PHYSICS IN MEDICINE & BIOLOGY
F.Therriault-Proulx, L.Archambault, L.Beaulieu, S.Beddar | Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA, Département de Physique, de Génie Physique et d’Optique, Université Laval, Québec, Québec, Canada, Département de Radio-Oncologie, Hôtel-Dieu de Québec, Centre Hospitalier Universitaire de Québec, Québec, Canada

Review of plastic and liquid scintillation dosimetry for photon, electron, and proton therapy

9. Advanced Dosimetry, kV Photon, MeV Electron, MV Photon, Proton (and other Particules), Fundamental Research Show more

While scintillation dosimetry has been around for decades, the need for a dosimeter tailored to the reality of modern radiation therapy-in particular a real-time, water-equivalent, energy-independent dosimeter with high spatial resolution-has generated renewed interest in scintillators over the last 10 years. This topical review is intended to provide the medical physics community with a wide overview of scintillation physics, related optical concepts, and applications of plastic scintillation dosimetry.

PHYSICS IN MEDICINE & BIOLOGY
L Beaulieu (1,2), S Beddar (3,4) | 1- Département de physique, génie physique et optique, et Centre de recherche sur le cancer, Université Laval, Québec, CA , 2- Département de radio-oncologie et Axe Oncologie du CRCHU de Québec, QC, CA, 3- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA, 4- The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, TX, USA

Water-equivalent plastic scintillation detectors for high-energy beam dosimetry: II. Properties and measurements

7. Commissioning, 9. Advanced Dosimetry, MeV Electron, MV Photon, Advanced Optical Dosimetry, Fundamental Research Show more

The properties of a new scintillation detector system for use in dosimetry of high-energy beams in radiotherapy have been measured. The most important properties of these detectors are their hgh spatial resolution and their nearly water-equivalence.

PHYSICS IN MEDICINE & BIOLOGY
A.S. Beddar, T.R. Mackie, F.H. Attix | Depanment of Medical Physics, University of Wisconsin Medical School, Madison, Wl, USA

Water-equivalent plastic scintillation detectors for high-energy beam dosimetry: I. Physical characteristics and theoretical consideration

7. Commissioning, 9. Advanced Dosimetry, MeV Electron, MV Photon, Advanced Optical Dosimetry, Fundamental Research Show more

A minimally perturbing plastic scintillation detector has been developed for the dosimetry of high-energy beams in radiotherapy. The detector system consists of two identical parallel sets of radiation-resistant optical fibre bundles, each connected to independent photomultiplier tubes.

PHYSICS IN MEDICINE & BIOLOGY
A.S. Beddar, T.R. Mackie, F.H. Attix | Depanment of Medical Physics, University of Wisconsin Medical School, Madison, Wl, USA

A method to correct for temperature dependence and measure simultaneously dose and temperature using a plastic scintillation detector

5. In Vivo Dosimetry, 9. Advanced Dosimetry, MeV Electron, MV Photon, Fundamental Research Show more

Plastic scintillation detectors work well for radiation dosimetry. However, they show some temperature dependence, and a priori knowledge of the temperature surrounding the plastic scintillation detectors is required to correct for this dependence.

PHYSICS IN MEDICINE & BIOLOGY
F.Therriault-Proulx, L.Wooton, S.Beddar | Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

Beam matching for small-field dosimetry applications using accelerator solenoid current and a miniature plastic scintillation detector.

1. Small-Field Dosimetry, 7. Commissioning, MV Photon, Commissioning, Quality Assurance Show more

The goal of this work is to determine the optimal accelerator solenoid current (ASOL) that minimizes the spread of measured small field output factor (OF) values between a series of machines. Small field OF measurements of 6 MV flattening filtered beams from 3 Varian TrueBeam linear accelerators were performed using a 1 mm diameter by 1 mm length plastic scintillation detector HYPERSCINT HS-RP200 research platform. In conclusion Small field dosimetry characteristics are highly sensitive to beam focal spot size. and the possibility to optimize accelerator focusing coil current to reduce OF and penumbra width spread enables new avenues in beam matching of series of machines, especially for SRS and SBRT techniques.

2022 COMP ANNUAL SCIENTIFIC MEETING
L.Gingras (1), F.Beaulieu (1), M.Besnier (1), B.Côté (2), D.Leblanc (2), L.Beaulieu (1), L.Archambault (1) | 1- CHU de Québec – Université Laval, QC, CA, 2- MEDSCINT, QC, CA

Dosimetric Characterization of the ARIEL 10 MV X-Ray Ultrahigh Dose-Rate (FLASH) Irradiation Platform at TRIUMF

4. FLASH-RT / UHDR, 9. Advanced Dosimetry, MV Photon, Detector comparaison, Fundamental Research Show more

The purpose was to characterize the beam delivery capabilities and dose rates achievable on the new ultrahigh dose-rate 10MV x-ray irradiation platform at TRIUMF. Beam commissioning and dosimetry have been conducted on the ARIEL x-ray FLASH irradiation platform using film doses and scintillators. Measured dose rates support that the 10MV x-ray beam may be used as a UHDR source compatible with FLASH radiobiological experiments.

2022 AAPM ANNUAL MEETING
N.Esplen (1), L.Egoriti (2), T.Planche (3), A.Hart (1), B.Paley (3), C.Hoehr (3), A.Gottberg (3), M.Bazalova-Carter (1) | 1- University of Victoria, BC ,CA, 2- University of British Columbia, BC, CA, 3- TRIUMF, BC, CA

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

3. Treatment Plan (End-to-End) QA, 9. Advanced Dosimetry, MV Photon, Advanced Optical Dosimetry, Multi-point Dosimetry, 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

External beam irradiation angle measurement using Cerenkov emission

8. Cherenkov Dosimetry, 9. Advanced Dosimetry, MV Photon, Advanced Optical Dosimetry, Monte Carlo Simulations Show more

In this study, we propose a novel approach designed to take advantage of the Cerenkov angular dependency to perform a direct measurement of an external beam radiation angle of incidence. The detector offers promising perspectives for external beam radiotherapy and brachytherapy applications.

MEDICAL PHYSICS
E.Jean (1,2,3), S.Lambert-girard (4), F.Therriault-Proulx (4), L.Beaulieu (1,2) | 1- Département de physique, génie physique et optique, et Centre de recherche sur le cancer, Université Laval, QC, Canada, 2- Département de radio-oncologie et Axe Oncologie du CRCHU de Québec, QC, CA, 3- Département de radio-oncologie du CIUSSS-MCQ, CHAUR de Trois-Rivières, QC, Canada, 4- MEDSCINT, QC, Canada