Development of a new ridge filter with honeycomb geometry for scanning system in particle radiotherapy

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K19214
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Medical Physics and Radiological Technology
• Research Institution: National Institutes for Quantum and Radiological Science and Technology
• Principal Investigator: Tansho Ryohei 国立研究開発法人量子科学技術研究開発機構, 放射線医学総合研究所加速器工学部, 研究員 (80735126)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: リッジフィルタ / スキャニング照射法 / ビーム微細化 / ハニカム型構造

Outline of Final Research Achievements

For particle radiotherapy, the current trend is to decrease lateral beam size to improve dose conformity in a tumor. We have developed a new ridge filter with 2-dimensional honeycomb geometry to simultaneously achieve both a decrease in lateral beam size and the desired energy modulation. We calculated dose distribution and found that the beam with smaller lateral size passing through a conventional ridge filter with 1-dimensional stepped structure cannot reproduce the designed dose distribution. However, we confirmed that using the new 2D ridge filter, the dose distribution was accurately reproduced. We actually manufactured the new ridge filter and also experimentally confirmed the reproducibility of dose distribution by the measurement.

Free Research Field

医学物理学