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Contrast-enhanced photon-counting detector CT images in an 85-year-old female patient following transcatheter aortic valve replacement with a stent in the left main coronary artery. (A) Ultra-high-resolution (UHR) image of the valve and stent (axial plane). UHR image shows (B) incomplete stent expansion (arrow) with (C, D) axial reconstructions perpendicular to the stent axis. QIR = quantitative iterative reconstruction.
