Photon Counting Computed Tomography

**Semantic type:** Diagnostic Procedure

**Definition:** A computed tomography technique that uses energy-resolving x-ray detectors to count the number of incoming photons and measure photon energy. This results in higher contrast-to-noise ratio, improved spatial resolution, and optimized spectral imaging. It can reduce radiation exposure, reconstruct images at a higher resolution, and optimize the use of contrast agents.

**Synonyms:** - PCCT - PCD-CT - Photon-Counting CT - Photon-Counting Computed Tomography - Photon-counting Detector CT