Dual-Source Photon-Counting Computed Tomography — Part I: Clinical Overview of Cardiac CT and Coronary CT Angiography Applications

If coronary CT has a frontier, this review is a dispatch from it. Photon-counting CT is a new detector technology, and the authors survey what it promises for imaging the heart.

The gains are physical. By counting individual X-ray photons rather than measuring their pooled energy, the technique delivers higher spatial resolution and fewer “blooming” artifacts — the glare from dense calcium that can make a calcified narrowing look worse than it is on conventional scanners. For coronary imaging, that translates into clearer assessment of stenosis and plaque, and better characterization of the heart muscle itself.

The practical implication is a potential reset of what non-invasive coronary imaging can resolve: fewer indeterminate scans, less overcalling of calcified lesions. The resistance is the usual inertia of a large installed base of conventional CT, with vendors and centers invested in legacy equipment.

We rate the evidence low, by design — photon-counting CT is genuinely new, and this is a 96-reference narrative review of an emerging technology with little long-term outcome validation yet. Clinical significance scores higher: if the early promise holds, the resolution gains are the kind that change diagnostic accuracy. But availability is still limited and the outcome data isn’t in. Worth watching closely; too soon to lean on.