Patent ID: 8759784

Claim:
A high-energy radiation detector apparatus, comprising: a high-energy radiation detector substrate comprising a first surface and a second opposing surface; a plurality of charge collection electrodes disposed on the first and second opposing surfaces of the detector substrate, wherein the first surface comprises a pixelated distribution of charge collection electrodes disposed thereon forming an array and the second surface comprises a pixelated distribution of charge collection electrodes disposed thereon forming an array; charge collection circuitry associated with the plurality of charge collection electrodes for collecting charge induced on the charge collection electrodes by a high energy radiation photon interaction event caused by high-energy radiation incident on the detector substrate: and signal processing circuitry configured to compare charge values representative of charge collected from corresponding charge collection electrodes of the respective first and second surfaces for determining a depth value for a photon interaction event in the detector substrate, wherein the signal processing circuitry is configured to determine the depth value for a photon interaction event in the detector substrate by establishing the ratio of the charge collected by an electrode for the first surface to the charge collected by an electrode for the second surface, and locating that ratio in a data set having charge ratio values paired with depth values to determine a corresponding depth value.