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.

Dependencies are inferred from the claim text.