Spectrally selective X-ray imaging provides improved material and tissue discrimination in comparison to state-of-art dual energy technologies that are commonly used in medical, industrial, and security applications. Cadmium Telluride (CdTe) and Cadmium Zinc Telluride (CdZnTe) based line scanners and small size two-dimensional X-ray sensors are emerging to the market, but the need for large scale panels is axiomatic. In this study, a seamless CdTe tile was developed that enables the implementation of large-sized, energy selective X-ray detector panels. The developed tile consists of a 64 × 64 pixel array (with 150 µm pitch) with a necessary substrate, ASIC, and CdTe crystal. The performance of the constructed seamless tile was characterized by focusing on spectral resolution and stability. In addition, a simple pixel trimming method that automates the equalization of each energy selective pixel was developed and analyzed.The obtained results suggest that the proposed concept of seamless (tileable) detector structures is a feasible approach to scale up panel sizes. The seamless tile shows comparable spectral resolution and stability performance with commercial CdTe sensors. The effect of tile to tile variation, the realization of a largescale panel, as well as the charge sharing performance, were left out of the scope and are to be studied in the next phase.
We present laboratory results from our compound semiconductor program designed to produce X-and gamma-ray detectors with both high spectral and spatial resolution and with high quantum efficiencies over the energy range 1 to 500 keV. A number of materials are presently under study, including GaAs, InP, CdZnTe, HgI 2 and TlBr. Extensive measurements on simple monolithic detectors and small format arrays have been carried out both in our laboratory and at the ESRF, HASYLAB and BESSY II synchrotron radiation facilities. The results have been used in conjunction with a material science program ultimately intended to produce near Fano limited, monolithic detectors and large area pixelated arrays for the next generation X-ray astrophysics and planetary space missions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.