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Sökning: WFRF:(Fiederle M.)

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  • Fröjdh, Erik, et al. (författare)
  • Count rate linearity and spectral response of the Medipix3RX chip coupled to a 300μm silicon sensor under high flux conditions
  • 2014
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 9:4, s. Art. no. C04028-
  • Tidskriftsartikel (refereegranskat)abstract
    • For clinical X-ray imaging, the detector performance under high flux conditions is very important, with typical flux rates for modern CT systems reaching 109 photons s-1 mm-2 in the direct beam. In addition, for spectral imaging a good energy resolution under these conditions is needed. This poses difficulties, since pulse pileup in the pixel electronics does not only affect the count rate, leading to a deviation from the otherwise linear behavior, but also degrades the spectral response of the detector, making k-edge subtraction and other contrast enhancement techniques less efficient. In this paper, we investigate the count rate capabilities and the energy response of the Medipix3RX chip under high flux conditions using 10 keV monochromatic photons. © CERN 2014.
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3.
  • Ballabriga, Rafael, et al. (författare)
  • The Medipix3RX: a high resolution, zero dead-time pixel detector readout chip allowing spectroscopic imaging
  • 2013
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 8:2, s. C02016-
  • Tidskriftsartikel (refereegranskat)abstract
    • The Medipix3 chips have been designed to permit spectroscopic imaging in highly segmented hybrid pixel detectors. Spectral degradation due to charge sharing in the sensor has been addressed by means of an architecture in which adjacent pixels communicate in the analog and digital domains on an event-by-event basis to reconstruct the deposited charge in a neighbourhood prior to the assignation of the hit to a single pixel. The Medipix3RX chip architecture is presented. The first results for the characterization of the chip with 300 μm thick Si sensors are given. ~ 72e− r.m.s. noise and ~ 40e− r.m.s. of threshold dispersion after chip equalization have been measured in Single Pixel Mode of operation. The homogeneity of the image in Charge Summing mode is comparable to the Single Pixel Mode image. This demonstrates both modes are suitable for X-ray imaging applications.
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