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High spatial resolution spectroscopic X-ray imaging using the Medipix3RX and first measurements with the Timepix3

Abstract: The addition of spectroscopic information to x-ray images has the potential to open up new applications, particularly in medical imaging. Accessing the spectroscopic information requires that individual photons be detected one by one and binned according to their energy. However, charge deposition effects (and especially fluorescence in high-Z materials) and diffusion during charge collection lead to distortions in the recorded spectrum. The Medipix3RX chip embodies one solution to this challenge. Simultaneous hits in pixels within a neighbourhood are detected, local charge sums generated, and the hit allocated to the pixel of the neighbourhood with the largest initial charge. Recent results using this chip with various sensor materials will be presented. Another possible approach to the challenge would be to record the amplitudes and time stamps of hits in each pixel separately and send those off chip for processing as quickly as possible. Such a data-push architecture has been implemented in the recently developed Timepix3 chip. Initial electrical measurements taken using this device will also be presented.
Speaker: Michael Campbell - CERN
Speaker Bio: Michael Campbell has been working at CERN in Geneva since 1988. He helped pioneer the use of hybrid pixel detectors for High Energy Physics. The early work at CERN in the RD19 Collaboration was the precursor to the large pixel detector systems now operating at the LHC experiments. He was one of the lead designers of the Alice pixel detector chip and also played a key role in the development of the pixel-based photon detectors used at LHCb. In recent years he has been Spokesperson of the Medipix2 and Medipix3 Collaborationswhich have developed successive generations of single photon counting readout chips. He leads the Medipix design team at CERN and has been appointed recently as CERN section leader for microelectronics.
Poster Link: Poster