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

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

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.

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