Three-dimensional (3D) dose distribution measurements of proton beam using a glass plate

Ryo Horita, Seiichi Yamamoto, Katsunori Yogo, Masataka Komori, Toshiyuki Toshito

研究成果: Article査読

7 被引用数 (Scopus)

抄録

The measurements of the three-dimensional (3D) dose distribution of proton beams in water are critical for proton therapy for quality assessment (QA). Although ionization chambers are commonly used for this purpose, such measurements take a long time to calculate precise 3D dose distribution. To solve this problem, we measured 3D dose distributions using a glass plate. We placed a 1-mm thick float glass plate on the upper inside of a black box with a water tank set above the float glass plate outside the black box and irradiated the proton beam to the water tank from the upper side. The attenuated proton beam by water in the tank was detected by the float glass plate and a scintillation image was formed in the plate. The image was reflected by a first-surface mirror set below the float glass plate and detected by a cooled charge-coupled device (CCD) camera from the side. We changed the water depths in the tank and measured the scintillation images at each depth. Then we calculated the 3D scintillation images from the measured images by stacking them in the depth direction. Measurements were made for 71.2- and 100-MeV proton pencil beams and a spread-out Bragg peak (SOBP) using the imaging system. From the images, we successfully formed 3D scintillation images without quenching. The depth profiles measured from the scintillation images showed almost identical distribution with those measured by the ionization chamber within a maximum difference less than 5%. The lateral profiles were also almost identical within width differences less than 2 mm. We conclude that our proposed method is promising for the 3D dose distribution measurements of proton beams.

本文言語English
論文番号045033
ジャーナルBiomedical Physics and Engineering Express
5
4
DOI
出版ステータスPublished - 2019 7月 12
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • バイオエンジニアリング
  • 生体材料
  • 生理学
  • 生体医工学
  • 放射線学、核医学およびイメージング
  • コンピュータ サイエンスの応用
  • 健康情報学

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