@misc{oai:repo.qst.go.jp:00071748,
 author = {Saotome, Naoya and Hara, Yousuke and Mizushima, Kota and Tansho, Ryohei and Saraya, Yuichi and Furukawa, Takuji and Shirai, Toshiyuki and Noda, Koji and 早乙女 直也 and 原 洋介 and 水島 康太 and 丹正 亮平 and 皿谷 有一 and 古川 卓司 and 白井 敏之 and 野田 耕司},
 month = {Sep},
 note = {Purpose
National Institute of Radiological Sciences have been commissioning the irradiation method that employs more than 200 multiple beam energies supplied by synchrotron instead of the energy degraders. The accuracy of the beam energy/range is required for heavy ion treatment especially for using scanning method. ICRU78 recommend checking the range constancy for daily QA. Therefore easy and simple range verification system is required. The purpose of this work is to develop range verification system using scintillator and CCD (charge-coupled device) camera and to estimate the accuracy of the range verification using the system.
Material and methods
Using proposed system, projected depth dose distribution could be provided by one measurement. A EJ-200 plastic scintillator block was selected for obtained pure tranceparent block. The scintillator was mounted in the black box in order to shade a light in the room. The CCD camera (Type BU-41L, 1360x1024 pixels, Bitran Corp., Japan) was installed perpendicular to the beam axis. Therefore two-dimensional image projected depth dose distribution is provided by measurement. Total 131 mono-energy carbon beams that are in the range from 56 to 332 MeV/n were tested. The range resolution test was performed using range shifter made by PMMA plate placed upstream of the system. Edge positions at the distal region that were detected by image processing were compared with expected position.
Result
Measurement time was about 9 minutes for 131 energy beams. Peak-entrance ratio was small due to quenching effect and absorption of the light within the scintillator block. The 1 mm range difference was clearly divided. Standard deviation of repeating measurement was less than 0.3 mm. The difference of fluence with normal treatment operation didn’t effect the range verification.
Conclusion
The range check system using scintillator and CCD have nice characteristics for range verification with short time., The 7th Korea-Japan Joint Meeting on Medical Physics},
 title = {Characteristic of the range verification system using scintillator and CCD camera system},
 year = {2014}
}