Photon counting x-ray detector with overrange logic control

A radiographic imaging system comprising:

• a radiation source configured to project x-rays toward a subject to be scanned;
• a detector assembly comprising a first detector layer and a second detector layer, the second layer positioned to receive x-rays from the radiation source that pass through the first detector layer, each of the first and second layers configured to receive x-rays projected from the radiation source and convert radiographic energy to electrical signals representative of energy sensitive radiographic data;
• and
• a controller configured to:
• receive a logic output signal from the second detector layer indicative of a saturation level of the first detector layer;
• compare the logic output signal to a threshold value;
• and
• output electrical signals from the first detector layer, the second detector layer, or a combination thereof to an image chain for image reconstruction based on the received data.

A method of fabricating an imaging system, the method comprising:

• providing an x-ray source;
• positioning a first detector to receive x-rays that emit from the x-ray source;
• positioning a second detector to receive x-rays that emit from the x-ray source and that pass through the first detector;
• and
• electrically coupling a logic device to the first and second detectors, the logic device configured to:
• receive a logic output signal from the second detector indicative of a saturation level of the first detector;
• compare the logic output signal to a threshold value;
• and
• output, based on the comparison, electrical signals from the first detector. the second detector, or a combination thereof to an image chain.