特集 ｢放射線の二次元三次元計測」
光CTによる陽子線線量分布測定の原理
2002 年 28 巻 3 号 p. 243-247
詳細
2002 年 28 巻 3 号 p. 243-247
The Light CT was designed and developed in order to make the measurement of the proton 3-d dose distribution easy and reliable. It is composed of a scintillation part that emits light according to the proton dose distribution and a CCD camera that can detect the emitted light from arbitrary direction. The principle of Light-CT is basically similar to that of X-ray CT. The proton 3-d dose distribution was reconstructed by the filtered back projection method. The evaluation of its performance was made using the proton radiation field that has four different residual ranges. This demonstrated that Light-CT could measure the proton 3-d dose distribution in use of the principle of the Light CT. However, it also showed some problems such as reduction of resolutions due to the light scattering in the scintillation part. We plan to investigate its effect using the numerical phantom.
