Key result
OCT yields ~7.5-fold higher axial resolution than IVUS for coronary plaque visualization.
Why the study?
Current imaging modalities lack sufficient resolution to identify thin fibrous caps in vulnerable coronary plaques, limiting visualization of plaque components in living patients.
Does intravascular optical coherence tomography improve visualization of coronary plaque components compared to intravascular ultrasound in patients with coronary atherosclerosis?
Observational (n=10)
Does intravascular optical coherence tomography improve visualization of coronary plaque components compared to intravascular ultrasound in patients with coronary atherosclerosis?
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“This was expected because OCT has a far greater resolution than IVUS and was initially introduced to study superficial plaque components”
Intravascular OCT is a safe and feasible imaging modality that provides significantly higher axial resolution than IVUS, allowing for more detailed structural assessment of coronary plaques.
OBJECTIVES: The aim of this study was to evaluate the feasibility and the ability of intravascular optical coherence tomography (OCT) to visualize the components of coronary plaques in living patients. BACKGROUND: Disruption of a vulnerable coronary plaque with subsequent thrombosis is currently recognized as the primary mechanism for acute myocardial infarction. Although such plaques are considered to have a thin fibrous cap overlying a lipid pool, imaging modalities in current clinical practice do not have sufficient resolution to identify thin (< 65 microm) fibrous caps. Optical coherence tomography is a new imaging modality capable of obtaining cross-sectional images of coronary vessels at a resolution of approximately 10 microm. METHODS: The OCT images and corresponding histology of 42 coronary plaques were compared to establish OCT criteria for different types of plaques. Atherosclerotic lesions with mild to moderate stenosis were identified on angiograms in 10 patients undergoing cardiac catheterization. Optical coherence tomography and intravascular ultrasound (IVUS) images of these sites were obtained in all patients without complication. RESULTS: Comparison between OCT and histology demonstrated that lipid-rich plaques and fibrous plaques have distinct OCT characteristics. A total of 17 IVUS and OCT image pairs obtained from patients were compared. Axial resolution measured 13 +/- 3 microm with OCT and 98 +/- 19 microm with IVUS. All fibrous plaques, macrocalcifications and echolucent regions identified by IVUS were visualized in corresponding OCT images. Intimal hyperplasia and echolucent regions, which may correspond to lipid pools, were identified more frequently by OCT than by IVUS. CONCLUSIONS: Intracoronary OCT appears to be feasible and safe. Optical coherence tomography identified most architectural features detected by IVUS and may provide additional detailed structural information.
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Jang et al. (2002) conducted an observational in Coronary atherosclerotic plaques (n=10). Intravascular optical coherence tomography (OCT) vs. Intravascular ultrasound (IVUS) was evaluated on Axial resolution and visualization of architectural plaque features. Intracoronary optical coherence tomography safely visualized coronary plaque features with a superior axial resolution of 13 +/- 3 microm compared to 98 +/- 19 microm for intravascular ultrasound.
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