Purpose or Case Report: Photon-counting detector (PCD) CT utilizes a charged semiconductor element directly paired with a high-resolution detector panel. The direct conversion of detected photons into electrical signal represents the most recent generational advance in CT technology. Changes to detector technology achieved with PCDs has the potential to reduce image noise, improve spatial resolution, improve contrast resolution, and provide multispectral imaging capability. Importantly, these gains may be achieved with an overall decrease in radiation and iodinated contrast dose.

This exhibit reviews the underlying technology of the PCD using clinical scans of pediatric patients performed on the first commercially available PCCT. We present examples of (1) PCD noise reduction capability; (2) improvements in spatial resolution; (3) improvements in contrast resolution; and (4) uses of multispectral capability. These are presented in comparison to the latest generation energy integrating detector (EID) CTs to highlight reductions in radiation dose and contrast media dose.
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