“…The ultra-high resolution is achieved by cutting the crystal into a sub-mm pixel. The INSERT project, which several groups in EU are working on, aims to develop preclinical and clinical SPECT/MRI systems for chemo therapy, and is on this path [14,21,[25][26][27][28][29]. The project developed a sub-mm resolution detector using CsI (TI) with SiPM readout [25].…”