Dual Plane 3D Compton Scattering Imager with Pixelated CZT Detectors for 1-10MeV Gamma Ray

Phase I has proven that the current setup achieves better than 8mm spatial resolution for 2.2MeV prompt gammas. However, 1mm spatial resolution presents a significant challenge for the current setup due in part to limited timing resolution and count rate. A new analog ASIC will be developed to replace the current analog ASIC that will have better timing resolution and deliver higher count rates. In addition, the dynamic range of the new analog ASIC will increase to 9MeV to measure prompt gammas from elements other than hydrogen. In parallel to the analog ASIC development, a dual plane hybrid Compton camera will be built with our existing digital ASIC. This ASIC has similar timing resolution and dynamic range to the new analog ASIC but operates at lower count rates. It will serve as a testbed for high-energy gamma imaging studies during Phase II. The goal of these studies is to identify and approach the limits of spatial resolution for our dual plane imager by optimizing both the imager design and source-detector configuration. The final goal is to achieve 1 mm spatial resolution at 2.2MeV with 1% H concentration in 3 dimensions.