TY - JOUR
T1 - Characteristics of fiber-optic radiation sensor for passive scattering proton beams
AU - Son, J.
AU - Kim, M.
AU - Jeong, J.
AU - Lim, Y.
AU - Lee, S. B.
AU - Shin, D.
AU - Yoon, M.
N1 - Funding Information:
This work was supported by the National Nuclear R&D Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (NRF-2015M2A2A7A02045275) and by the Nuclear Safety Research Program through the Korea Foundation Of Nuclear Safety (KOFONS), a granted financial resource of the Nuclear Safety and Security Commission (NSSC), Republic of Korea (No. 1305033).
Publisher Copyright:
© 2017 The Author(s).
PY - 2017/11/20
Y1 - 2017/11/20
N2 - The aims of this study were to investigate the characteristics of a fiber-optic radiation sensor (FORS) that detects the fluorescence light produced by proton beam and to verify its effectiveness in proton therapy quality assurance (QA). Various characteristics of the FORS were investigated, such as the linearity of its relationships to the sensitive length of fiber for the proton beams of intermediate ranges (165.46 and 178.37 MeV) and to the measured dose, as well as its dose rate dependence. In addition, patient specific precription dose QA was conducted for five patients actually undergoing proton therapy and the results were compared with the doses measured using an ion chamber. The results show that the signal of the FORS is linearly related to the sensitive length of fiber and to the irradiated dose in the range from 1 to 500 cGy. The QA results obtained using the FORS system showed good agreement with the corresponding ion chamber results, with an average difference of 0.40% and a standard deviation of 0.35%. The FORS was dose-rate independent for proton currents up to 5 Gy/min. The profiles of various proton beams obtained using an array of FORS, which were measured as an application of the developed dosimetric system, closely agreed with the profiles acquired using EBT3 film. In summary, the experimental results of FORS demonstrated its effectiveness for use in various proton therapy QA tests.
AB - The aims of this study were to investigate the characteristics of a fiber-optic radiation sensor (FORS) that detects the fluorescence light produced by proton beam and to verify its effectiveness in proton therapy quality assurance (QA). Various characteristics of the FORS were investigated, such as the linearity of its relationships to the sensitive length of fiber for the proton beams of intermediate ranges (165.46 and 178.37 MeV) and to the measured dose, as well as its dose rate dependence. In addition, patient specific precription dose QA was conducted for five patients actually undergoing proton therapy and the results were compared with the doses measured using an ion chamber. The results show that the signal of the FORS is linearly related to the sensitive length of fiber and to the irradiated dose in the range from 1 to 500 cGy. The QA results obtained using the FORS system showed good agreement with the corresponding ion chamber results, with an average difference of 0.40% and a standard deviation of 0.35%. The FORS was dose-rate independent for proton currents up to 5 Gy/min. The profiles of various proton beams obtained using an array of FORS, which were measured as an application of the developed dosimetric system, closely agreed with the profiles acquired using EBT3 film. In summary, the experimental results of FORS demonstrated its effectiveness for use in various proton therapy QA tests.
KW - Dosimetry concepts and apparatus
KW - Photon detectors for UV, visible and IR photons (vacuum) (photomultipliers, HPDs, others
UR - http://www.scopus.com/inward/record.url?scp=85038599942&partnerID=8YFLogxK
U2 - 10.1088/1748-0221/12/11/P11015
DO - 10.1088/1748-0221/12/11/P11015
M3 - Article
AN - SCOPUS:85038599942
SN - 1748-0221
VL - 12
JO - Journal of Instrumentation
JF - Journal of Instrumentation
IS - 11
M1 - P11015
ER -