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Journal of Biomedical Optics

Application of Cerenkov radiation generated in plastic optical fibers for therapeutic photon beam dosimetry
Author(s): Kyoung Won Jang; Takahiro Yagi; Cheol Ho Pyeon; Wook Jae Yoo; Sang Hun Shin; Chiyoung Jeong; Byung Jun Min; Dongho Shin; Tsuyoshi Misawa; Bongsoo Lee
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Paper 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.

Paper Details

Date Published: 1 February 2013
PDF: 8 pages
J. Biomed. Opt. 18(2) 027001 doi: 10.1117/1.JBO.18.2.027001
Published in: Journal of Biomedical Optics Volume 18, Issue 2
Show Author Affiliations
Kyoung Won Jang, Kyoto Univ. (Korea, Republic of)
Takahiro Yagi, Kyoto Univ. (Japan)
Cheol Ho Pyeon, Kyoto Univ. (Japan)
Wook Jae Yoo, Konkuk Univ. (Korea, Republic of)
Sang Hun Shin, Konkuk Univ. (Korea, Republic of)
Chiyoung Jeong, National Cancer Ctr. (Korea, Republic of)
Byung Jun Min, National Cancer Ctr. (Korea, Republic of)
Dongho Shin, National Cancer Ctr. (Korea, Republic of)
Tsuyoshi Misawa, Kyoto Univ. (Japan)
Bongsoo Lee, Konkuk Univ. (Korea, Republic of)

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