2013 Fiscal Year Final Research Report

Development of dose verification program using plastic scintilation detector

Research Project

Project/Area Number	24791300
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Radiation science
Research Institution	Osaka University
Principal Investigator	SUMIDA Iori 大阪大学, 医学(系)研究科(研究院), 助教 (10425431)
Project Period (FY)	2012-04-01 – 2014-03-31
Keywords	放射線治療物理学 / シンチレータ / CCDカメラ / 線量分布 / QA/QC / 強度変調放射線治療 / リアルタイム
Research Abstract	In general radiographic film or radiochromic film are used to verify the dose idstribution. Although the characteristic of the film is superior for the spatial resolution, the handling of film is complecated and there is uncertainty for the convert between density and absorbed dose. In this study the new radiation detector using scintilation light named plastic scintilator was chosen to verify the dose distribution. The CCD camera was used to detect the scintilation light. With respect to the beam output, the linearity and reproducibility were evaluated with plastic scintilation detector and compared with the ionization chamber as a reference. It was found that the good agreement between two detectors except very low monitor unit which was not usually used in general radiation treatment. Finally the dose vefirication for intensity modulated radiation therapy was performed using plastic scintilation detector. There were also good agreement between measurements and calculations.