ChromAIX: Fast energy resolved photon-counting readout electronics for future human Computed Tomography

ChromAIX is an ASIC for fast single photon-counting designed to study the feasibility of energy-resolved photon-counting human Spectral CT. It allows for reading out 4 × 16 pixels of a direct converting sensor made of Cd[Zn]Te with a pixel pitch of about 300μm. It supports K-edge imaging [3]. After thorough electrical testing reported in [6] characterization under g- and X-rays was done giving promising results as to the behavior of the ASIC, and revealing the known limitations of direct conversion material (flux limitation, polarization behavior). Measurements with g- and X-rays are compared with simulation results, and good correspondence is obtained.