A Multi-Point Optical Fibre Sensor for Proton Therapy

Author:

Penner Crystal123,Usherovich Samuel1,Andru Sophia1,Bélanger-Champagne Camille1ORCID,Duzenli Cheryl2ORCID,Stoeber Boris3,Hoehr Cornelia1

Affiliation:

1. Life Sciences Division, TRIUMF, Vancouver, BC V6T 2A3, Canada

2. BC Cancer, Vancouver, BC V5Z 4E6, Canada

3. Faculty of Applied Science, University of British Columbia, Vancouver, BC V6T 1Z4, Canada

Abstract

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.

Funder

National Research Council of Canada

Publisher

MDPI AG

Reference51 articles.

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2. Ozkan Loch, C., Eichenberger, M.A., Togno, M., Zinsli, S.P., Egloff, M., Papa, A., Ischebeck, R., Lomax, A.J., Peier, P., and Safai, S. (2020). Characterization of a low-cost plastic fiber array detector for proton beam dosimetry. Sensors, 20.

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