Compton imaging Camera using an Electron-Tracking gaseous TPC and a scintillation camera

We are developing an Electron-Tracking Compton imaging Camera (ETCC) based on a gaseous Time Projection Chamber (TPC) and a scintillation camera. The ETCC detects the energy and the direction of the incident gamma ray using the information of the recoil electron and the scattered gamma ray. We have developed the ETCC with a detection volume of 23 × 28 × 30 cm³ which consists of the 23 × 28 × 30 cm³ gaseous TPC and 30 × 30 cm² GSO(Ce) scintillation camera. And we obtained the gamma-ray image and investigated the performances of the ETCC. The Angular Resolution Measure (ARM) and the Scatter Plane Deviation (SPD) are 6.1 degree and 64.5 degree (HWHM) at 662keV, respectively, and the energy resolution is 18.0%(FWHM) at 662keV.