Development of a full three dimensional dose distribution measurement system for intensity modulated proton therapy

2014 Fiscal Year Final Research Report

• Project/Area Number: 24601013
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: 医学物理学・放射線技術学
• Research Institution: Nagoya City University
• Principal Investigator: TOSHITO Toshiyuki 名古屋市立大学, 医学(系)研究科(研究院), 研究員 (30377965)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA Mitsuhiro 名古屋大学, 大学院理学研究科, 教授 (90183889)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 強度変調陽子線治療 / シンチレーティングファイバー / 品質管理

Outline of Final Research Achievements

We developed fully three-dimensional dose distribution measurement system for the purpose of quality assurance for intensity modulated proton therapy. A scintillating fiber block was used as a detector. We manufactured it by stacking approximately 18000 500 μm-diameter-scintillating fibers. It measures 90 mm x 62 mm x 107 mm. We conducted beam test to measure basic characteristics of the detector by using proton beam at Nagoya Proton Therapy Center. Measurements of dose distribution for double-scattered and spot scanning irradiation were carried out by taking images with the 10 degree step rotation of the detector system. A software to reconstruct three-dimensional dose distribution using a Maximum-Likelihood Expectation Maximization algorithm was developed. Finally we obtained 1 mm pitch dose distribution by using this system.

Free Research Field

医学物理学