Direct-Conversion X-Ray Imaging Detector Improvements and Observations

摘要

DirectRay~(~R) direct-conversion digital x-ray-imaging detectors using selenium exhibit high sensitivity and resolution to x-ray energies just below the K-fluorescence edge compared to energies just above. Detector sensitivity and self-protected dynamic range can be manipulated by modifying dielectric thickness and selenium electric field. Replacing the dielectric layer with a charge-transport layer (CTL) allows a faster cycle time, lower residual-image charge, improved signal to noise ratio, and better operating stability. The new CTL structure allows fast multi-frame imaging, enabling applications such as dual-energy subtraction, tomosynthesis, and dynamic imaging (fluoroscopy).