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1996 Fiscal Year Final Research Report Summary

Development of new devices measuring dose distributions in a tissue equivalent material and incident electron energies for therapeutic electron beams

Research Project

Project/Area Number 07680528
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field エネルギー学一般・原子力学
Research InstitutionNagoya University

Principal Investigator

AOYAMA Takahiko  Nagoya University, College of Medical Technology, Associate Professor, 医療技術短期大学部, 助教授 (80023307)

Co-Investigator(Kenkyū-buntansha) KOYAMA Shuji  Nagoya University, College of Medical Technology, Assistant Professor, 医療技術短期大学部, 助手 (20242878)
TSUZAKA Masatoshi  Nagoya University, College of Medical Technology, Assistant Professor, 医療技術短期大学部, 助手 (40155354)
MAEKOSHI Hisashi  Nagoya University, College of Medical Technology, Professor, 医療技術短期大学部, 教授 (50124722)
Project Period (FY) 1995 – 1996
KeywordsRadiation therapy / Medical accelerator / Beam monitor / Electron beam measurement / Electron beam energy / Absorbed dose / Dose distribution / Scintillating fiber
Research Abstract

1. A new type of beam-energy monitor has been developed to check the energies of electron beams from radiotherapy accelerators. The monitor consists of a pair of scintillating fibers and photodiode read-out circuits that measure the energy depencence of electron transmission through a wedge-shaped absorber. A linear energy response and 1% accuracy for energy constancy measurements were attained with the monitor. The monitor having advantages of simple mechanical and electronic constructions, small size and low cost is suitable for practical use as a portable device.
2. A new type of depth-dose measuring device has been developed for electron beam therapy. The device employs plastic scintillating fiber detectors inserted in a plastic (PMMA) phantom in line along an incident electron beam. Output photons from a fiber, the number of which is proportional to absorbed dose at each depth of the phantom, were converted to an electric signal with a photodiode. Each signal from the photodiode was transmitted to a personal computer through a multi-channel AD converter and processed to draw a depth-dose curve on the computer display. A depth-dose curve could be obtained in a measuring time of 5 sec for each incident electron beam with an energy range between 4 and 21 MeV.The mean electron energies estimated using the curves and a depth-scaling factor for PMMA were consistent with those obtained by conventional depth-dose measurements using an ion chamber and a water phantom. The newly developed device, being simple and not time consuming, is suitable for routine use as a quality assurance tool for therapeutic electron beams.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Takahiko Aoyama: "A beam-energy checking devece for electron beams from radiotherapy accelerators" KEK Proceedings. 95-1. 284-292 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahiko Aoyama: "A scintillating fiber beam-energy monitor for electron beam therapy" Medical Physics. 22. 2101-2102 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青山隆彦: "電子線エネルギー簡易測定法の開発" 日本放射線技術学会雑誌. 52. 422-425 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青山隆彦: "シンチレーションファイバー検出器アレイを用いる電子線の深部吸収線量分布計測システムの開発" 日本放射線技術学会雑誌. 53. 231-231 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahiko Aoyama: "A depth-dose measuring device using a multi-channel scintillating fiber array for electron beam therapy" Medical Physics. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahiko Aoyama: "A beam-energy checking device for electron beams from radiotherapy accelerators" KEK Proceedings. 95-1. 284-292 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahiko Aoyama: "A scintillating fiber beam-energy monitor for electron beam therapy" Medical Physics. 22. 2101-2102 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahiko Aoyama: "Simple beam-energy checking devices for electron beams from therapeutic accelerators" Japanese Journal of Radio logical Technology. 52. 422-425 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahiko Aoyama: "Development of a depth-dose measuring device using multi-channel scintillating fiber detectors" Japanese Journal of Radio logical Technology. 53. 231 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahiko Aoyama: "A depth-dose measuring device using a multi-channel scintillating fiber array for electron beam therapy" Medical Physics. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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