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X-ray imaging is a widely used imaging modality in the medical diagnostic field due to its availability, low cost, high spatial resolution and fast image acquisition. X-ray photons in standard X-ray sources are polychromatic. Detectors that allow to extract the "colour" information of the individual X-rays can lead to contrast enhancement, improved material identification or reduction of beam hardening artifacts at the system level, if we compare them with the widely spread energy integrating detectors. Today, in the field of CT, prototypes of clinical grade based on Spectral Photon Counting detectors are currently available for clinical research from different companies. The key system component in that development is the detector. The Hybrid Pixel Detector technology, whereby a 2-dimensional matrix of microscopic radiation-sensitive elements each of which is connected to its own pulse processing readout electronics, has been chosen to meet the requirements for that detector. The technology originally developed for High Energy Physics, has been disseminated to many other fields of science.
This contribution will review the different ASICs that have been designed for Spectroscopic X-ray imaging. Different architectures implemented in spectroscopic readout ASICs will be analysed. For example the event-by-event processing on the pixel will be compared to the off-chip single hit data processing. Conclusions will be extracted from the analysis of the ASICs.