Photon-Counting CT: See more with less radiation

For radiology practices, this means greater precision in the interpretation of CT scans. The finest anatomical structures can be visualized with greater distinction, while typical artifacts, such as those seen in dense tissues or calcifications, are reduced. Additionally, the technology reduces radiation exposure, which is particularly important for repeat examinations and sensitive patient groups.

The use of this technology at the University Hospital of Giessen (UKGM) serves as a prime example of how these technological advantages can make a difference. Since early 2026, the hospital has been using a photon-counting CT scanner, one of the most advanced systems in the world.

"For example, changes associated with interstitial lung diseases can be visualized much more clearly, allowing for significantly more precise and earlier diagnoses by making even the smallest changes visible."

The technology also opens up new possibilities in cardiovascular imaging. "With conventional technology, it was often difficult to assess sections of blood vessels with severe wall calcifications, as the calcifications led to image artifacts. Photon-counting devices allow for the examination of calcified vessel sections without artifacts. This can spare many patients from having to undergo invasive coronary angiography."

In addition to image quality, speed also plays a key role. Photon-counting CT enables very short scan times. A complete scan for emergency patients can sometimes be performed in less than a second.

This has a direct impact on daily clinical practice. Diagnoses can be reached faster, motion artifacts are reduced, and equipment utilization improves. For hospitals with high patient volumes, this results not only in increased efficiency but also in faster availability of diagnostic results.

For clinical decision-makers, the question arises as to which areas offer the greatest added value when using a photon-counting computed tomography scanner. The experience from Giessen highlights where its use is particularly beneficial:

• in pulmonary diagnostics, particularly for interstitial diseases,
• in cardiovascular imaging for calcified vessels,
• in oncology for earlier and more precise detection,
• as well as in emergency diagnostics, where rapid CT examinations are crucial.

Photon-counting CT pushes the boundaries of CT imaging, particularly in cases where conventional systems reach their diagnostic limits. This broadens the range of diagnostic options without requiring additional tests. Findings from the University Hospital of Giessen demonstrate how this technological potential can be gradually integrated into everyday clinical practice.