Detection limits of front-end IC architectures for hybrid imaging X-ray detectors

Michalowska-Forsyth, Alicja Malgorzata

doi:10.1016/j.nima.2017.11.015

Cited by 1 publication

(1 citation statement)

References 52 publications

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“…One or more threshold comparators are connected to corresponding counters; when the signal exceeds one of the thresholds, the corresponding counter is incremented by 1 [3]. The "photon counting" approach thus discards small signals and corresponding noise (along with detailed spectral information of individual photons), providing a compact, lossy summary of data [16,37,38]; the noise is still present (over-imposed on photon signals), leading to a relatively limited spectroscopic resolution of photon counting detectors [37].…”

Section: Photon Countingmentioning

confidence: 99%

Dead-time correction for spectroscopic photon-counting pixel detectors

Blaj¹

2019

J Synchrotron Rad

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Modern photon‐counting pixel detectors have enabled a revolution in applications at synchrotron light sources and beyond in the last decade. One of the limitations of the current detectors is their reduced counting linearity or even paralysis at high counting rates, due to dead‐time which results in photon pile‐up. Existing dead‐time and pile‐up models fail to reproduce the complexity of dead‐time effects on photon‐counting, resulting in empirical calibrations for particular detectors at best, imprecise linearization methods, or no linearization. This problem will increase in the future as many synchrotron light sources plan significant brilliance upgrades and free‐electron lasers plan moving to a quasi‐continuous operation mode. Presented here are the first models that use the actual behavior of the analog pre‐amplifiers in spectroscopic photon‐counting pixel detectors with constant current discharge (e.g. the Medipix and CPix families of detectors) to deduce more accurate analytical models and optimal linearization methods. In particular, for detectors with at least two counters per pixel, the need for calibration, or previous knowledge of the detector and beam parameters (dead‐time, integration time, large sets of synchrotron filling patterns), is completely eliminated. This is summarized in several models of increasing complexity and accuracy. Finally, a general empirical approach is presented, applicable to any particular cases where the analytical approach is not sufficiently precise.

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Section: Photon Countingmentioning

confidence: 99%

Dead-time correction for spectroscopic photon-counting pixel detectors

Blaj¹

2019

J Synchrotron Rad

View full text Add to dashboard Cite

show abstract

Detection limits of front-end IC architectures for hybrid imaging X-ray detectors

Cited by 1 publication

References 52 publications

Dead-time correction for spectroscopic photon-counting pixel detectors

Dead-time correction for spectroscopic photon-counting pixel detectors

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