Program Information
Characteristics of Fiber-Optic Radiation Sensor for Proton Therapeutic Beam
J Son1*, M Kim2 , U Hwang3 , J Park4 , Y Lim5 , S Lee6 , S Park7 , M Yoon8 , D Shin9 , (1) Korea University,Seoul & National Cancer Center, Goyang-si, Korea (2) Dongnam Institution of Radiological&Medical Sciences, Busan, Korea (3) National Medical Center in Korea, Seoul, Korea (4) National Cancer Center, Goyang-si, Korea (5) National Cancer Center, Goyang-si, Korea(6) National Cancer Center, Goyang-si, Korea (7) McLaren Cancer Institute, McLaren-Flint, USA (8) Korea University, Seoul, Korea (9) National Cancer Center, Goyang-si, Korea
Presentations
SU-E-T-159 (Sunday, July 12, 2015) 3:00 PM - 6:00 PM Room: Exhibit Hall
Purpose: A fiber-optic radiation sensor using Cerenkov radiation has been widely studied for use as a dosimeter for proton therapeutic beam. Although the fiber-optic radiation sensor has already been investigated for proton therapeutic, it has been examined relatively little work for clinical therapeutic proton beams. In this study, we evaluated characteristics of a fiber-optic radiation sensor for clinical therapeutic proton beams. We experimentally evaluated dose-rate dependence, dose response and energy dependence for the proton beam.
Methods: A fiber-optic radiation sensor was placed in a water phantom. Beams with energies of low, middle and high were used in the passively-scattered proton therapeutic beam at the National Cancer Center in Korea. The sensor consists of two plastic optical fibers (POF). A reference POF and 2 cm longer POF were used to utilize the subtraction method for having sensitive volume. Each POF is optically coupled to the Multi-Anode Photo Multiplier Tube (MAPMT) and the MAPMT signals are processed using National Instruments Data Acquisition System (NI-DAQ). We were investigated dosimetric properties including dose-rate dependence, dose response and energy dependence.
Results: We have successfully evaluated characteristics of a fiber optic radiation sensor using Cerenkov radiation. The fiber-optic radiation sensor showed the dose response linearity and low energy dependence. In addition, as the dose-rate was increased, Cerenkov radiation increased linearly.
Conclusion: We evaluated the basic characteristics of the fiber optic radiation sensor, the dosimetry tool, to raise the quality of proton therapy. Based on the research, we developed a real time dosimetry system of the optic fiber to confirm the real time beam position and energy for therapeutic proton pencil beam.
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