OCT
Pronunciation: O-C-T
Also written as: OCT — optical coherence tomography
Optical coherence tomography; high-resolution intravascular imaging using infrared light to visualize coronary microstructure.
Full Definition
Optical coherence tomography (OCT) is an intravascular imaging technique that uses near-infrared light to generate high-resolution cross-sectional images of coronary arteries. With approximately 10-fold higher resolution than IVUS (10-20 μm vs 100-200 μm), OCT provides detailed visualization of plaque microstructure, thin fibrous caps, macrophages, and stent strut coverage. OCT requires contrast injection or blood displacement for optimal imaging due to light absorption by red blood cells. It is particularly valuable for assessing vulnerable plaque characteristics, guiding complex percutaneous interventions, and evaluating stent healing and neoatherosclerosis.
Usage
Usage note: Specify fibrous cap thickness in micrometers; thin cap < 65 μm indicates vulnerability.
In Context
- "OCT imaging revealed a thin fibrous cap of 45 μm overlying a lipid-rich plaque." — Interventional cardiology report
- "High-resolution OCT demonstrated excellent stent apposition with minimal tissue coverage at 6 months." — Follow-up catheterization note