Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
권호 표지

Fabrication and Optimization of a Fiber-optic Dosimeter for Proton Beam Therapy Dosimetry

의료용 양성자선 계측을 위한 광섬유 방사선량계의 제작 및 최적화

  • Jang, Kyoung-Won (School of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Cho, Dong-Hyun (School of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Yoo, Wook-Jae (School of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Seo, Jeong-Ki (School of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Lee, Bong-Soo (School of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Biomedical & Health Science, Konkuk University) ;
  • Hwang, Eui-Jung (Proton Therapy Center, National Cancer Center) ;
  • Shin, Dong-Ho (Proton Therapy Center, National Cancer Center) ;
  • Park, Sung-Yong (Proton Therapy Center, National Cancer Center)
  • 장경원 (건국대학교 의학공학부 의공학실용기술연구소) ;
  • 조동현 (건국대학교 의학공학부 의공학실용기술연구소) ;
  • 유욱재 (건국대학교 의학공학부 의공학실용기술연구소) ;
  • 서정기 (건국대학교 의학공학부 의공학실용기술연구소) ;
  • 이봉수 (건국대학교 의학공학부 의공학실용기술연구소) ;
  • 황의중 (국립암센터 양성자치료센터) ;
  • 신동호 (국립암센터 양성자치료센터) ;
  • 박성용 (국립암센터 양성자치료센터)
  • Received : 2009.11.25
  • Accepted : 2009.12.28
  • Published : 2010.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, we have fabricated a fiber-optic dosimeter for a proton beam therapy dosimetry. We have measured scintillating lights with the various kinds of organic scintillators and selected the BCF-12 as a sensor-tip material due to its highest light output and peak/plateau ratio. To determine the optimum diameter of BCF-12, we have measured scintillating lights according to the energy losses of proton beams in a water phantom. Also, we determined the adequate length of organic scintillator by measuring scintillating lights according to the incident angles of proton beam. Using an optimized fiber-optic dosimeter, we have measured scintillating lights according to the dose rates and monitor units of proton accelerator.

본 연구에서는 치료용 양성자선 계측을 위한 광섬유 방사선량계 개발을 목적으로 최적화 과정의 기초연구를 통하여 광섬유 방사선량계를 제작하였다. 양성자선 계측의 최적화를 위해 유기섬광체의 종류에 따른 섬광량 및 브래그 피크의 피크/플래투를 측정하여 가장 효율이 뛰어난 섬광체를 선별하였고, 유기섬광체의 직경에 따라 물 팬텀의 각 깊이에서 손실되는 양성자선의 에너지에 대해 유기섬광체에서 발생되는 섬광량을 측정하여 유기섬광체의 직경에 따른 선형성을 도시하고 최적의 섬광체 직경을 선택하였다. 또한 양성자선의 조사각도에 대해 유기섬광체의 길이에 따른 섬광량 및 섬광량의 표준편차를 측정하여 입사각 의존도를 판별하고 최적의 섬광체 길이를 결정하였다. 최적화 과정을 통하여 제작된 센서 성능평가의 일환으로 양성자 가속기의 선량율 및 모니터 유닛에 따른 광섬유 방사선량계의 섬광량을 측정하였다.

Keywords

References

  1. Frelin AM, Fontbonne JM, Ban G, et al: Spectral discrimination of Cerenkov radiation in scintillating dosimeters, Med. Phys 32:3000-3006 (2005) https://doi.org/10.1118/1.2008487
  2. White TO: Scintillating fibers. Nucl Instr Phys Res A 273:820-825 (1988) https://doi.org/10.1016/0168-9002(88)90102-7
  3. Beddar AS: Plastic scintillation dosimetry and its application to radiotherapy. Radiation Measurements 41:S124-S133 (2007)
  4. Beddar AS, Kinsella TJ, Ikhlef Colin A, et al: A miniature "Scintillator-Fiberoptic-PMT" detector system for the dosimetry of small fields in stereotactic radiosurgery, IEEE Trans. Nucl Sci 48:924-928 (2001) https://doi.org/10.1109/23.940133
  5. Archambault L, Beddar AS, Gingras Colin L, et al: Water-equivalent dosimeter array for small-field external beam radiotherapy. Med Phys 34:1583-1592 (2007) https://doi.org/10.1118/1.2719363
  6. Laguesse M, Bourdinaud M: Characterization of fluorescent plastic optical fibers for X-ray beam detection. SPIE 1592:96-107 (1991)
  7. Blumenfeld H, Bourdinaud M, Stirling AV: Ageing of scintillating fibers, natural and otherwise. Nucl Instrum Meth A 279: 281-284 (1989) https://doi.org/10.1016/0168-9002(89)91094-2
  8. Torrisi L: Plastic scintillator investigations for relative dosimetry in proton-therapy. Nucl Instrum Meth B 170:523-530 (2000) https://doi.org/10.1016/S0168-583X(00)00237-8
  9. Knoll GF: Radiation detection and measurement. 3nd ed. John Wiley & Sons, New York (1999), pp. 227