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. Author manuscript; available in PMC: 2017 Jul 1.

Published in final edited form as: Invest Radiol. 2016 Jul;51(7):421–429. doi: 10.1097/RLI.0000000000000251

Images of a cadaver head. (a) energy integrating detector (EID) images, (b) photon counting detector (PCD) images (low energy bin), (c) PCD images (high energy bin). The high-energy images of the posterior fossa acquired using the PCD subsystem showed considerably less beam-hardening artifact between the areas of dense bone than the EID image and low energy PCD image. While water beam hardening corrections were applied to the images as part of the normal image reconstruction, 2nd order bone beam hardening corrections were not applied here. This was done to demonstrate that beam-hardening artifacts that normally require algorithmic correction were not present in the uncorrected high-energy PCD image.

Images of a cadaver head. (a) energy integrating detector (EID) images, (b) photon counting detector (PCD) images (low energy bin), (c) PCD images (high energy bin). The high-energy images of the posterior fossa acquired using the PCD subsystem showed considerably less beam-hardening artifact between the areas of dense bone than the EID image and low energy PCD image. While water beam hardening corrections were applied to the images as part of the normal image reconstruction, 2nd order bone beam hardening corrections were not applied here. This was done to demonstrate that beam-hardening artifacts that normally require algorithmic correction were not present in the uncorrected high-energy PCD image.