<unk>  (PCCT) is a form of X-ray<unk>  tomography (CT) in which X-rays are detected using a<unk> -counting detector (PCD). The first clinically-approved PCCT system was cleared by the Food and Drug Administration (FDA) in September 2021.<unk> -counting CT offers several significant advantages over other existing CT imaging techniques and continues to inspire and make possible completely novel applications. A<unk> -counting CT system employs a<unk> -counting detector (PCD) which registers the interactions of individual<unk> s. By keeping track of the deposited energy in each interaction, the detector pixels of a PCD each record an approximate energy spectrum, making it a spectral or energy-resolved CT technique. In contrast, more conventional CT scanners use energy-integrating detectors (EIDs), where the total energy (generally from a large number of<unk> s as well as electronic noise) deposited in a pixel during a fixed period of time is registered. These EIDs thus register only<unk>  intensity, comparable to black-and-white<unk> raphy, whereas PCDs register also spectral information, similar to color<unk> raphy.
Photon-counting computed tomography
Neutron imaging
Xenon gas MRI
Neutron stimulated emission computed tomography
Gallium scan
Single-photon emission computed tomography
Whole-body counting
Xenon-enhanced CT scanning