Ultra-High-Resolution CT for Coronary CT Angiography vs Invasive Coronary Angiography

This small observational study compared ultra-high-resolution CT (U-HRCT) against invasive coronary angiography (ICA) as the reference standard in 38 patients, evaluating diagnostic accuracy for coronary artery stenosis detection.

U-HRCT demonstrated high sensitivity (≥95%) and specificity (≥90%) for detecting significant coronary stenosis (≥50% luminal narrowing), with per-segment analysis showing improved visualization of smaller vessels compared with conventional CT. The spatial resolution advantage of U-HRCT — approximately double that of standard multi-detector CT — was most apparent in distal and small-branch vessel segments.

Ultra-high-resolution CT represents the next advancement in detector technology, offering a pixel matrix approximately 1.5× larger than current high-resolution scanners and spatial resolution approaching 0.25 mm. The technology enables better visualization of small-caliber coronary arteries, stent lumen, and calcified plaque microstructure — segments that have historically been challenging for CT to characterize accurately.

At n=38, this study demonstrates feasibility and preliminary diagnostic accuracy rather than establishing the technology’s clinical utility in large-scale validation. The imaging technology space is now evolving rapidly — photon-counting CT offers comparable or superior spatial resolution with additional spectral capabilities, and clinical adoption will be shaped by head-to-head comparisons with established techniques across larger patient populations.

We rate the evidence limited. A small feasibility study demonstrating high diagnostic accuracy of ultra-high-resolution CT for coronary stenosis detection — technically promising but awaiting larger validation studies before clinical impact can be fully assessed.