In-vivo dose reconstruction using EPID and Monte Carlo simulation

• Project/Area Number: 25861125
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Radiation science
• Research Institution: University of Tsukuba (2014); Keio University (2013)
• Principal Investigator: TAKEI Hideyuki 筑波大学, 附属病院, 病院講師 (20645452)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 放射線治療 / X線 / モンテカルロシミュレーション / 線量計算 / EPID

Outline of Final Research Achievements

The purpose of this study was to device a new system that reconstructs the real-time dose distribution inside patients to evaluate an accuracy of the photon therapy.
We used an Electronic Portal Imaging Device (EPID) and Monte Carlo simulation (MC) for dose reconstruction. The therapeutic photons were irradiated to a phantom that simulated human body. The MC calculated all the photon process such as entering and being absorbed inside the phantom, and the formation of the EPID image. The reconstructed dose distributions were compared to the measurement. They agreed well with the measurements within 3%. The results suggested that our system reconstructed the dose distribution accurately.
Those achievement were reported at The 107th Meeting of Japan Society of Medical Physics and The 7th Korea-Japan Joint Meeting on Medical Physics.

Research Products

• [Presentation] EPID RESPONSE TO THE ENERGY SPECTRUM CHANGES TO HUMAN BODY TRANSMISSION (2014)
  • Author(s): Y. Watanabe, H. Takei, T. Isobe, K. Takada, E. Sato, N. Shuto, S. Noda, K. Yogo, K. Hayakawa
  • Organizer: 14th Asia-Oceania Congress of Medical Physics
  • Place of Presentation: Hotel Novotel Saigaon Centre, Ho Chi Monh City, Vietnam
  • Year and Date: 2014-10-23 – 2014-10-25
• [Presentation] Contribution of scattered photon to EPID image in photon therapy (2014)
  • Author(s): H. Takei, Y. Watanabe, T. Isobe, K. Takada, E. Sato, H. Hara, H. Muraishi, T. Hasegawa
  • Organizer: The 7th Korea-Japan Joint Meeting on Medical Physics
  • Place of Presentation: BEXCO, Busan, Korea
  • Year and Date: 2014-09-25 – 2014-09-27
• [Presentation] Response of electric portal imaging device to energy spectrum of therapeutic photons (2014)
  • Author(s): Hideyuki Takei, Yusuke Watanabe, Tomonori Isobe, Kenta Takada, Naoyuki Shigematsu, Eisuke Sato, Hidetake Hara, Hiroshi Muraishi, Tomoyuki Hasegawa
  • Organizer: Europian Congress of Radiology 2014
  • Place of Presentation: Austria Center Vienna
• [Presentation] 治療用X線のエネルギーに対するEPIDの応答 (2013)
  • Author(s): 武居 秀行、渡邉 祐介、高田 健太、佐藤 英介、浅井 博之、秋田 峻吾、茂松 直之、原 秀剛、村石 浩、長谷川 智之、磯辺 智範
  • Organizer: 第106回日本医学物理学会学術大会
  • Place of Presentation: 大阪大学コンベンションセンター