OCT compared with IVUS in a coronary lesion assessment: the OPUS-CLASS study

Area of Science:

• Cardiovascular Imaging
• Medical Device Technology
• Interventional Cardiology

Background:

• Accurate coronary luminal measurement is crucial for diagnosing and managing coronary artery disease.
• Frequency domain optical coherence tomography (FD-OCT) offers high resolution and excellent contrast, suggesting potential for precise lumen assessment.
• Comparison with established techniques like quantitative coronary angiography (QCA) and intravascular ultrasound (IVUS) is necessary to validate FD-OCT's reliability.

Purpose of the Study:

• To evaluate the reliability of FD-OCT for coronary artery measurements.
• To compare FD-OCT measurements with those obtained from QCA and IVUS.
• To assess FD-OCT's accuracy and reproducibility in both clinical and phantom settings.

Main Methods:

• A prospective multicenter study involving 100 patients with coronary artery disease.
• Coronary arteries were imaged using angiography, FD-OCT, and IVUS.
• Phantom models with known lumen dimensions were analyzed using FD-OCT and IVUS.
• Quantitative image analysis was performed by an independent core laboratory.

Main Results:

• FD-OCT measurements of minimum lumen diameter were significantly different from both QCA and IVUS.
• FD-OCT showed a strong correlation with IVUS for minimum lumen area, with lower measurement variability.
• In phantom models, FD-OCT accurately measured lumen area with high reproducibility, while IVUS overestimated and was less reproducible.

Conclusions:

• FD-OCT provides accurate and reproducible quantitative measurements of coronary dimensions in clinical practice.
• FD-OCT demonstrates superior performance compared to IVUS in terms of accuracy and reproducibility for phantom models.
• The findings support the clinical utility of FD-OCT for reliable coronary assessments.