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Research Papers: Sensing

Application of Cerenkov radiation generated in plastic optical fibers for therapeutic photon beam dosimetry

[+] Author Affiliations
Kyoung Won Jang

Kyoto University, Research Reactor Institute, Nuclear Engineering Science Division, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan

Konkuk University, Research Institute of Biomedical Engineering, School of Biomedical Engineering, Chungju 380-701, Korea

Takahiro Yagi, Cheol Ho Pyeon, Tsuyoshi Misawa

Kyoto University, Research Reactor Institute, Nuclear Engineering Science Division, Asashiro-nishi, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan

Wook Jae Yoo, Sang Hun Shin, Bongsoo Lee

Konkuk University, Research Institute of Biomedical Engineering, School of Biomedical Engineering, Chungju 380-701, Korea

Chiyoung Jeong, Byung Jun Min, Dongho Shin

National Cancer Center, Proton Therapy Center, Goyang 410-769, Korea

J. Biomed. Opt. 18(2), 027001 (Feb 01, 2013). doi:10.1117/1.JBO.18.2.027001
History: Received October 20, 2012; Revised December 18, 2012; Accepted December 18, 2012
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Abstract.  A Cerenkov fiber-optic dosimeter (CFOD) is fabricated using plastic optical fibers to measure Cerenkov radiation induced by a therapeutic photon beam. We measured the Cerenkov radiation generated in optical fibers in various irradiation conditions to evaluate the usability of Cerenkov radiation for a photon beam therapy dosimetry. As a results, the spectral peak of Cerenkov radiation was measured at a wavelength of 515 nm, and the intensity of Cerenkov radiation increased linearly with increasing irradiated length of the optical fiber. Also, the intensity peak of Cerenkov radiation was measured in the irradiation angle range of 30 to 40 deg. In the results of Monte Carlo N-particle transport code simulations, the relationship between fluxes of electrons over Cerenkov threshold energy and energy deposition of a 6 MV photon beam had a nearly linear trend. Finally, percentage depth doses for the 6 MV photon beam could be obtained using the CFOD and the results were compared with those of an ionization chamber. Here, the mean dose difference was about 0.6%. It is anticipated that the novel and simple CFOD can be effectively used for measuring depth doses in radiotherapy dosimetry.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Kyoung Won Jang ; Takahiro Yagi ; Cheol Ho Pyeon ; Wook Jae Yoo ; Sang Hun Shin, et al.
"Application of Cerenkov radiation generated in plastic optical fibers for therapeutic photon beam dosimetry", J. Biomed. Opt. 18(2), 027001 (Feb 01, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.2.027001


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