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Optical fiber dosimeter for real-time in-vivo dose monitoring during LDR brachytherapy

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journal contribution
posted on 2020-07-06, 08:02 authored by Peter Woulfe, F.J. Sullivan, Wern Kam, Sinéad O'Keeffe
An optical fiber sensor for monitoring low dose radiation is presented. The sensor, based on radiation sensitive scintillation material, terbium doped gadolinium oxysulphide (Gd2O2S:Tb), is embedded in a cavity of 700μm diameter within a 1mm plastic optical fiber. The sensor is compared with the treatment planning system for repeatability, angular dependency, distance and accumulated radiation activity. The sensor demonstrates a high sensitivity of 152 photon counts/Gy with a temporal resolution of 0.1 seconds, with the largest repeatability error of 4.1%, to 0.361mCi of Iodine-125 the radioactive source most commonly used in LDR brachytherapy for treating prostate cancer.

History

Publication

Biomedical Optics Express;11,(7) pp. 4027- 4036

Publisher

Optical Society of America

Note

peer-reviewed

Other Funding information

Royal Historical Society, SFI

Language

English

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