Performance of the HYPERSCINT scintillation dosimetry research platform for the 1.5 T MR-linac

This study demonstrates the suitability of the HYPERSCINT PSD for accurate time- resolved dosimetry measurements in the 1.5 T MR-linac. The excellent performance during continuous MR scanning and during dynamic movement indicates the great potential of the detector to validate end-to-end workflows of online adaptive radiotherapy

Prescilla Uijtewaal, Benjamin Côté (2), Thomas Foppen (1), J H Wilfred de Vries (1), Simon J Woodings (1), Pim T S Borman (1), Simon Lambert-Girard (2), François Therriault-Proulx (2), Bas W Raaymakers (1), Martin F Fast (1) | 1 – UMC Utrecht, Netherland, 2 – Medscint, Canada

Plastic scintillation detectors: real-time dosimetry in the MR-Linac environment.

Optical innovation meets clinical translation : in the vanguard of adaptive MR/RT research effort, the UMC Utrecht research team works with plastic scintillation detectors to bring MR-Linac treatment to the next level.

| UMC Utrecht, Medscint

First Experimental Demonstration of Time-Resolved Plastic Scintillation Dosimetry On An MR-Linac

In this study, UMC Utrecht research team demonstrates the feasibility of a hybrid experimental setup combining an innovative multipoint scintillator detector with film in a moving phantom quantifying MLC tracking for lung SBRT. The prototype cassette is capable of measuring dose (with film and 4 points scintillators simultaneously) during motion experiments, combining film dosimetry with time-resolved and absolute dosimetry.

P.Uijtewaal (1), P.Borman (1), B.Côté (2), Y.Lechasseur (2), J.Turcotte (2), S.Lambert-girard (2), P.Woodhead (1), S.Woodings (1), Vries (1), R.Flores (3), S.Smith (3), B.Raaymakers (1), M.Fast (1) | 1 – UMC Utrecht, Netherland, 2 – Medscint, Canada, 3 – Modus Medical Devices, Canada

On the orientation independence of the HYPERSCINT scintillation dosimetry research platform in a MR-linac environment.

The purpose of this work was to characterize the HYPERSCINT scintillation dosimetry research platform in a MR-linac environment, particularly with respect to its orientation. This study shows that the HYPERSCINT scintillation dosimetry platform can be used regardless of its orientation in a magnetic field environment. Together with its linearity to dose and dose-rate, the detector shows great promises for development of dosimetry solutions dedicated to the MR-Linac environment.

B.Côté (1), B.Raaymakers (2), S.Woodings (2), P.Uijtewaal (2), Vries (2), S.Lambert-girard (1), F.Therriault-Proulx (1), M.Fast (2) | Medscint, Canada (1), UMC Utrecht, Netherland (2)

Characterization of the HYPERSCINT Dosimetry System for Real-Time Dosimetry Measurements with the Varian TrueBeamLinac

Plastic scintillator/optical fibre dosimetry systems are advantageous due to their near water equivalence, waterproof construction, linear dose response, and good spatial resolution due to their small size. The nanosecond decay times of plastic scintillators enable the possibility of real-time dosimetry. We tested the new HYPERSCINT fibre detector system to determine if, in addition to the expected dose and field size responses, this system can provide real-time dose information. The HYPERSCINT system is suitable after appropriate calibration to be used to measure relative dose delivered in cGy as well as indicate changing dose conditions within 0.3 seconds.

2020 AAPM AM
C.Penner (1,2), C.Hoehr (2), C.Mendez (1), C.Duzenli (1) | BC Cancer, Vancouver, BC, CA, TRIUMF, Vancouver, BC, CA