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First Clinical Photon-Counting CT System Outperforms Current CT

OAK BROOK, Ill. (December 14, 2021) – The first clinical photon-counting-detector (PCD) CT system available for patient care outperforms current state-of-the-art CT systems, according to a new study published in the journal Radiology.

PCD-CT systems have shown several advantages over standard CT, including suppression of electronic noise, improved spatial resolution, and reduced radiation dose. PCDs directly convert x-rays to electrical signal, facilitating small detector pixel designs without loss of geometric dose efficiency and allowing simultaneous multi-energy CT through the use of multiple energy thresholds.

Advances in the detector technology have facilitated translation of PCDs to human imaging at clinical doses and dose rates, demonstrating potential clinical benefits for patients.

With the introduction of the first clinical PCD-CT, the beneficial characteristics of PCDs can be realized in clinical practice. However, a comprehensive performance assessment is needed to confirm current clinical requirements are met and to provide performance benchmarks. Cynthia McCollough, Ph.D., and colleagues from the Department of Radiology at the Mayo Clinic in Rochester, Minnesota—working with representatives from Siemens Healthineers in Forchheim, Germany, and Siemens Medical Solutions in Malvern, Pennsylvania—set out to assess the technical performance of a clinical PCD-CT.

“PCD-CT is so exciting because it provides information that existing CT detectors – the types that we’ve used for over 50 years ­– previously just couldn’t capture,” said Dr. McCollough, director of Mayo Clinic’s CT Clinical Innovation Center. “It allows us to scan faster, with lower radiation and contrast media doses, while obtaining higher quality images with greater spatial detail and lower noise levels. For many clinical applications, the improvements in image quality are really striking.”

For the study, the researchers analyzed the technical performance of a dual-source PCD-CT system for standard and high-resolution collimations. Noise power spectrum, modulation transfer function, section sensitivity profile, iodine CT number accuracy in virtual monoenergetic images, and iodine concentration accuracy were measured.

Four participants were enrolled between May 2021 and August 2021 in this prospective study and scanned using similar or lower radiation doses compared to same-day exams performed using energy-integrating-detector (EID) CT. Four clinical indications (CT angiography of the coronary arteries and abdomen/pelvis, whole-body low-dose CT for skeletal surveillance, and temporal bone imaging) were selected to illustrate in humans the effects of PCD-CT’s improved technical performance in phantoms. PCD-CT scans were performed at the same or lower radiation dose relative to the clinical exam.

The results showed that PCD-CT demonstrated superior spatial resolution relative to current CT systems and improved noise properties and multi-energy temporal resolution relative to similarly configured EID-CT.

The high-resolution mode of the PCD-CT demonstrated 125-micron in-plane spatial resolution and 0.3 mm longitudinal resolution, the smallest reported to date for a clinical CT system. The PCD-CT system provided 66-ms temporal resolution multi-energy imaging in dual source mode. Noise reduction (up to 47%) or dose reduction (up to 30%) were achieved in study participants using the PCD-CT system relative to a similar CT system equipped with conventional detectors.

“Every time that CT technology has advanced to provide new technical capabilities, new clinical applications have followed,” Dr. McCollough said. “With PCD-CT, we are seeing anatomy and disease at a resolution that has never before been achieved in patients, and that is providing physicians new information and insights—insights that can change patient management. In patients with coronary artery disease, for example, PCD-CT can provide diagnostic quality images in patients who previously were not good candidates for CT imaging of their coronary arteries. This will spare many patients from having to have more invasive types of testing.”


“First Clinical Photon-counting Detector CT System: Technical Evaluation.” Collaborating with Dr. McCollough was Kishore Rajendran, Ph.D., Martin Petersilka, Ph.D., André Henning, Ph.D., Elisabeth R. Shanblatt, Ph.D., Bernhard Schmidt, Ph.D., Thomas G. Flohr, Ph.D., Andrea Ferrero, Ph.D., Francis Baffour, M.D., Felix E. Diehn, M.D., Lifeng Yu, Ph.D., Prabhakar Rajiah, M.D., Joel G. Fletcher, M.D., and Shuai Leng, Ph.D.

This study was supported by the National Institutes of Health under award numbers R01 EB028590 and supported in kind by Siemens Healthineers GmbH, who own the evaluated system under the terms of a sponsored research agreement with the Mayo Clinic. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Health. The device described is CE labeled and has received 510k clearance by the U.S. Food and Drug Administration.

Radiology is edited by David A. Bluemke, M.D., Ph.D., University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, and owned and published by the Radiological Society of North America, Inc. (

RSNA is an association of radiologists, radiation oncologists, medical physicists and related scientists promoting excellence in patient care and health care delivery through education, research and technologic innovation. The Society is based in Oak Brook, Illinois. (

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