Guest Editorial Special Issue on Spectral CT

This special issue serves as a forum of high visibility and synergy to promote the momentum of spectral CT. Through a rigorous peer-review process, 14 high-quality papers1 have been included from leading groups around the world. These papers give a panorama of the state of the art, addressing challenges in detector and source technologies, image reconstruction, material decomposition, performance evaluation, biomedical, and other applications.