Optical fiber dosimeter for real-time in-vivo dose monitoring during LDR brachytherapy
Peter Woulfea b, Francis J Sullivanc d e, Wern Kamb, Sinéad O’Keeffeb
- aDept. of Radiotherapy Physics, Galway Clinic, Ireland
- bOptical Fiber Sensors Research Centre, University of Limerick, Ireland
- cDepartment of Radiotherapy, Galway Clinic, Ireland
- dProstate Cancer Institute, National University of Ireland Galway, Ireland
- eProstate Cancer Institute, National University of Ireland, Galway - Ireland
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Abstract
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.