Development of High Resolution Gamma-Detectors for PET A. Kobayashi, E. Yusaku, H. Ito, H. Kawai, T. Mizuno, F. Kento and S. Kimura EPJ Web Conf., 170 (2018) 09003 Published online: 10 January 2018 DOI: 10.1051/epjconf/201817009003