Abstract
Purpose: To evaluate existing and a new detector technologies for photon counting/energy resolving x‐ray and CT imaging. Materials and Methods: Digital mammography with photon counting Si and gaseous Xe detectors is now available. Although CZT and CdTe detectors are more attractive for photon counting x‐ray and CT imaging, they suffer from hole trapping and charge sharing between pixels, which decrease energy resolution, count rate, and spatial resolution. We have proposed using CZT/CdTe crystals in a tilted angle configuration when the x‐ray hits the crystal surface at a small angle. This allows decreasing crystal thickness significantly while maintaining high photon absorption. The tilted angle CZT/CdTe was simulated for 0.3–1 mm crystal thickness, 10°–90° tilting angles, and 50–150 keV photon energies. The results were compared to a crystal with 3 mm thickness used in normal irradiation. Experiments were performed with a tilted angle CZT with 2 mm crystal thickness using 59 keV and 122 keV photons and 110 kVp x‐ray. Results: The count rate of the tilted angle CZT detector was higher by 10–20 times for 0.3–1 mm crystal thickness and 50–150 keV photon energies compared to CZT with normal irradiation. The electron collection time was shorter by 3–6 times. The charge diffusion and charge sharing between pixels was decreased correspondingly. The experiments have shown significant decrease in tailing of the energy spectrum with tilted angle detector. The peak/tail ratio of the measured energy spectrum was increased by 2.4 and 2 times for 59 keV and 122 keV photons, respectively, when 20° tilting angle was used. Conclusion: The proposed tilted angle CZT/CdTe detector allows significant increase in count rate, energy resolution, and spatial resolution, as compared to currently used CZT/CdTe detectors. This potentially enables using tilted angle CZT/CdTe detectors for photon counting/energy resolving x‐ray and CT imaging.
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