Photon-counting detector CT with ultra-high-resolution (UHR) mode shows promise in enhancing coronary assessment by offering higher spatial resolution. In the present study, UHR- coronary CT angiography (CCTA) was compared to invasive quantitative coronary angiography (QCA) for evaluating coronary stenosis. Results revealed that UHR-CCTA significantly reduces overestimation bias in stenosis measurements, particularly in heavily calcified plaques, a known limitation of previous imaging methods. T…