Electric circuitry for baseline extraction in a photon counting system

A device for medical diagnostics, comprising:

• a photon counting circuitry comprising:
• a photon detector having a photon sensitive area, the photon detector being configured to generate a current signal in dependence on an impact of a photon on the photon sensitive area,
• a front-end electronic circuitry to receive the current signal and to provide a voltage signal in response to the current signal,
• an energy discriminator being connected to the front-end electronic circuitry, the energy discriminator being configured to generate a digital signal in dependence on a comparison of a level of the voltage signal with at least one threshold value, and
• an electric circuitry for a baseline extraction comprising:
• an input terminal to apply an input signal,
• an input signal integrity detector to determine an integrity of the input signal for the baseline extraction,
• a sampling circuit to sample the input signal during a sampling time, and to provide a sampled version of the input signal,
• a signal processing circuit to process the sampled version of the input signal, and
• a signal processing controller to control the signal processing circuit,
• wherein the input signal integrity detector is configured to determine the integrity of the input signal for the baseline extraction by evaluating the input signal or the sampled version of the input signal, and
• wherein the signal processing controller is configured to control the signal processing circuit so that the sampled version of the input signal is processed, when the integrity of the input signal for the baseline extraction is determined by the input signal integrity detector at least during the sampling time,
• wherein the energy discriminator is configured to adjust the at least one threshold value in dependence on an output signal provided by the electric circuitry for the baseline extraction, and
• wherein the device is configured as an X-ray apparatus or a computed tomography scanner.