Detector Pixel and Energy-Resolving Photon Counting Detector

Abstract: the present disclosure relates to a detector pixel for an energy-resolving photon counting detector, and to a photon counting detector comprising the same. the pixel comprises: a photodetector configured to convert an incident photon into a first signal indicative of an energy of the incident photon; a charge sensitive amplifier (csa) configured to convert the first signal at an input of the csa into a csa output signal at an output of the csa; and a dark current compensation unit (dccu) for compensating a dark current of the photodetector. the dccu comprises a signal following unit configured to provide an intermediate signal that is configured to follow a signal indicative of the csa output signal, with a first maximum signal change rate in a first direction and a second maximum signal change rate, lower than the first maximum signal change rate, in a second direction opposite the first direction, wherein the second direction is a direction in which the signal indicative of the csa output signal is configured to change when a photon is incident on the photodetector. the dccu further comprises a signal generation unit configured to generate a dark current compensation signal based on the intermediate signal and to provide said dark current compensation signal to the csa.

Inventor(s): Willem Johannes Kindt, Wasim Muhammad

CPC Classification: G01T1/17 (MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry ; tubes for determining the presence, intensity, density or energy of radiation or particles ))

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