Approaches, advantages, and challenges to photon counting detector and multi-energy CT

Giuseppe V. Toia*, Achille Mileto, Amir A. Borhani, Guang Hong Chen, Liqiang Ren, Jennifer W. Uyeda, Daniele Marin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Photon counting detector CT (PCD-CT) is the newest major development in CT technology and has been commercially available since 2021. It offers major technological advantages over current standard-of-care energy integrating detector CT (EID-CT) including improved spatial resolution, improved iodine contrast to noise ratio, multi-energy imaging, and reduced noise. This article serves as a foundational basis to the technical approaches and concepts of PCD-CT technology with primary emphasis on detector technology in direct comparison to EID-CT. The article also addresses current technological challenges to PCD-CT with particular attention to cross talk and its causes (e.g., Compton scattering, fluorescence, charge sharing, K-escape) as well as pile-up.

Original languageEnglish (US)
JournalAbdominal Radiology
StateAccepted/In press - 2024


  • Computed tomography
  • Multienergy CT
  • Photon counting CT

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Gastroenterology
  • Urology


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