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The image forming process in a CdTe detector is both a function of the X-ray interaction in the material, including scattering and fluorescence, and the charge transport in the material. The response of individual photons has been investigated using two pixellated CdTe image detectors with pixel pitches of 55 μm and 110 μm. The detectors were bonded to TIMEPIX readout chips and operated in time over...
X-ray imaging with spectral resolution, "Color X-ray imaging" is a new imaging technology that is currently attracting a lot of attention. It has however been observed that the quality of spectral response is degraded as the pixel size is reduced. This is an effect of charge sharing where the signal from a photon absorbed close to the border between two pixels is shared between pixels. This...
We are investigating pixellated radiation sensors based on cadmium zinc telluride (CZT) for gamma cameras in pre-clinical and clinical imaging applications. Each pixel allows one to acquire an energy spectrum in the range from 20 keV to 360 keV. We observe an energy resolution of 5.5 keV FWHM (3.9%) at 140 keV which allows one to distinguish different isotopes by their nuclear radiation emission energy...
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