Real-time dosimetry in radiotherapy using tailored optical fibers


Mizanur Rahman, A. K. M. and Hassan Tarif, Md. Zubair and Begum, Mahfuza Sharmila and Abdul Rashid, Hairul Azhar and Yusoff, Zulfadzli and Mohamad Omar, Nasr Yousef and Ung, Ngie Min and Mat Sharif, Khairul A. and Bradley, David Andrew (2016) Real-time dosimetry in radiotherapy using tailored optical fibers. Radiation Physics and Chemistry, 122. pp. 43-47. ISSN 0969-806X

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Real-time dosimetry plays an important role for accurate patient-dose measurement during radiotherapy. A tiny piece of laboratory fabricated Ge-doped optical fiber has been investigated as a radioluminescence (RL) sensor for real-time dosimetry over the dose range from 1 Gy to 8 Gy under 6 MV photon beam by LINAC. Fiber-coupled software-based RL prototype system was used to assess essential dosimetric characteristics including dose response linearity, dose rate dependency, sensitivity, repeatability and output dependence on field sizes. The consistency level of RL photon counts versus dose rate was also compared with that of standard Al2O3:C chips. Sensitivity of Ge-doped fiber were found to be sufficiently sensitive for practical use and also provided linear dose responses for various dose rates from 100 cGy/min to 600 cGy/min using both 6 MV photon and 6 MeV electron beams. SEM-EDX analysis was performed to identify Ge-dopant concentration level within the optical fiber RL material. Accumulated doses were also estimated using simple integral technique and the error was found to be around less than 1% under dissimilar dose rates or repeat measurements. The evaluation of the Ge-doped optical fiber based RL dosimeter system indicates its potential in medical dosimetry.

Item Type: Article
Uncontrolled Keywords: Real-time dosimetry, Radioluminescence, Ge-doped optical fiber, Radiotherapy
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Rosnani Abd Wahab
Date Deposited: 02 Feb 2017 08:09
Last Modified: 10 Sep 2021 07:55


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