Myocardial imaging using ultrahigh-resolution spectral domain optical coherence tomography

Area of Science:

• Biomedical Optics
• Medical Imaging
• Cardiovascular Research

Background:

• Optical Coherence Tomography (OCT) is a valuable non-invasive imaging modality.
• Myocardial imaging requires high resolution and penetration depth.
• Supercontinuum (SC) sources offer broad bandwidths for OCT but can be noisy.

Purpose of the Study:

• To develop and validate an ultrahigh-resolution spectral domain OCT system optimized for myocardial imaging.
• To analyze the noise characteristics of a supercontinuum source for OCT.
• To establish an imaging protocol for SC-based OCT with enhanced contrast.

Main Methods:

• Implementation of an 800 nm spectral domain OCT system utilizing a low-noise supercontinuum source.
• Characterization of axial resolution (2.72 μm), imaging depth (1.78 mm), and 6-dB falloff range (0.89 mm).
• Acquisition of 3D OCT datasets from human and swine heart tissue specimens (ex vivo).

Main Results:

• Achieved ultrahigh axial resolution of 2.72 μm and imaging depth of 1.78 mm.
• Demonstrated visualization of myocardial microstructures including elastic fibers, Purkinje fibers, and collagen bundles.
• Established an effective imaging protocol for SC-based OCT with improved contrast and noise management.

Conclusions:

• The developed ultrahigh-resolution OCT system enables detailed visualization of myocardial microarchitecture.
• SC-based OCT provides appreciable contrast and resolution for ex vivo cardiac tissue analysis.
• This technology holds potential for correlating cardiac structural information with pathology.