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Feasibility Study of 2D-Beam Monitoring System Using Optical-Fiber Radiation Sensor for Proton Pencil Beam

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J Son

J Son1*, J Jung2 , M Yoon3 , Y Lim4 , S Lee5 , S Lee6 , D Shin7 , (1) Korea University, Seoul, (2) National Cancer Center, Goyang-si, Gyeonggi-do, (3) Korea University, Seoul, (4) National Cancer Center, Goyang-si, Gyeonggi-do, (5) National Cancer Center, Goyang-si, Gyeonggi-do, (6) Kaiser Permanente Anaheim Medical Center, Anaheim, CA, (7) National Cancer Ceneter, Goyang-si, Gyeonggi-do


SU-I-GPD-T-149 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: We developed a 2D-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.
Methods: We have developed a fine segmented detector array to monitor PBS. A prototype beam monitor system using FORS has been developed for real-time display of the pencil beam status during the PBS mode operation. The x-y monitoring system with 128 channel readout is mounted to the snout for the real time monitoring. We measured the BSW for various 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 various BSP values measured using FORS.
Results: When comparing BSW values obtained using developed monitoring system to the measurements obtained using commercial EBT3 film, the average difference was 0.06 ± 0.05 mm. In the comparison of BSW values with the measurements obtained using another commercial product, Lynx based on a charge-coupled device camera, the average difference was 0.16 ± 0.01 mm. When comparing BSP measurements to the values calculated from RTP, the average difference was 0.45 ± 0.22 mm.
Conclusion: 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 patient.

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