Monte Carlo simulation of multi-head Si/CdTe Compton camera for medical imaging

モンテカルロシミュレーションを用いたマルチヘッドシリコンカドテル医用コンプトンカメラの検討

山口 充孝*; 河地 有木; 渡辺 伸*; 小高 裕和*; 武田 伸一郎*; 石川 真之介*; 青野 博之*; 高橋 忠幸*; 荒川 和夫; 中野 隆史*

Yamaguchi, Mitsutaka*; Kawachi, Naoki; Watanabe, Shin*; Odaka, Hirokazu*; Takeda, Shinichiro*; Ishikawa, Shinnosuke*; Aono, Hiroyuki*; Takahashi, Tadayuki*; Arakawa, Kazuo; Nakano, Takashi*

We have developed a prototype of Compton camera using Si/CdTe semiconductors for medical imaging. In the case where the detection area of Compton camera is restricted to small region, position resolution of depth direction is expected to be low. To overcome this weakness, we propose multi-head Compton camera. In this work, we evaluated the position resolutions of single- and double-head Compton camera by using Monte Carlo simulation. After the Monte Carlo simulation, two hit Compton event was selected, and back-projection and image reconstruction were performed in 3D-space. Consequently, the position resolution of the z-axis was about 5.6 mm for double-head camera whereas about 27 mm for single-head camera. These results indicate that the position resolution is improved and clear 3D-image is taken by using multi-head Compton camera.