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Technical principles of photon-counting detector CT (PCD-CT) compared to those of energy-integrated detector (EID)-CT. On the left side, a standard EID-CT is illustrated. EID-CT is characterized by the use of a scintillator and septa. On the right side, a PCD-CT that directly converts and counts X-ray photons into electrical signals without the need for scintillator layers is shown.
