Patent ID: 8488854

Claim:
An imaging system comprising: an x-ray source configured to project a beam of x-rays toward an object to be imaged; a detector configured to receive x-rays emitted from the x-ray source; a data acquisition system (DAS) operably coupled to the detector, the DAS comprising a discriminator assembly configured to count photon hits in the detector that occur at photon energies greater than or equal to a threshold level; and a computer operably coupled to the DAS and programmed to: cause the discriminator assembly to count photon hits in the detector having an energy level greater than or equal to a first threshold level during an imaging scan; cause the discriminator assembly to count photon hits in the detector having an energy level greater than or equal to a second threshold level during an the imaging scan, wherein the second threshold level is distinct from the first threshold level; modify the counted photon hits having an energy level greater than or equal to the first threshold level based on the counted photon hits having an energy level greater than or equal to the second threshold level; and reconstruct an image based on the modified photon hits and based on the counted photon hits having an energy level greater than or equal to the second threshold level.