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Development of Beam Monitoring System for Proton Pencil Beam Scanning Using Fiber-Optic Radiation Sensor
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 We aimed to develop a beam monitoring system based on a fiber-optic radiation sensor (FORS),
which can be used in real time in a beam control room, to monitor a beam in proton therapy, where
patients are treated using a pencil beam scanning (PBS) mode, by measuring the beam spot width
(BSW) and beam spot position (BSP) of the PBS. We developed two-dimensional detector arrays to
monitor the PBS beam in the beam control room. We measured the BSW for five energies of the PBS
beam and compared the measurements with those of Lynx and EBT3 film. In order to confirm the
BSP, we compared the BSP values of the PBS calculated from radiation treatment planning (RTP),
to five BSP values measured using FORS at 224.2 MeV. When comparing BSW values obtained
using developed monitoring system to the measurements obtained using commercial EBT3 film, the
average difference in BSW value of the PBS beam was 0.1 ± 0.1 mm. In the comparison of BSW
values with the measurements obtained using Lynx, the average difference was 0.2 ± 0.1 mm. When
comparing BSP measurements to the values calculated from RTP, the average difference was 0.4 ±
0.2 mm. The study results confirmed that the developed FORS-based beam monitoring system can
monitor a PBS beam in real time in a beam control room, where proton beam is controlled for the

Jaeman Son,∗ Jihye Koo, Sunyoung Moon and Myonggeun Yoon
Department of Bio-convergence Engineering, Korea University, Seoul 10408, Korea
Jonghwi Jeong,∗ Sun-Young Kim, Youngkyung Lim, Se Byeong Lee and Dongho Shin
Proton Therapy Center, National Cancer Center, Goyang 02841, Korea
Meyoung Kim
Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan 46033, Korea
Dongwook Kim
Department of Radiation Oncology, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea

Journal of the Korean Physical Society, Vol. 71, No. 7, October 2017, pp. 438∼443