Simultaneous dual-band ultra-high resolution optical coherence tomography

Area of Science:

• Biomedical Optics
• Medical Imaging
• Optical Engineering

Background:

• Optical Coherence Tomography (OCT) is a powerful non-invasive imaging technique.
• Achieving ultra-high resolution and multi-wavelength imaging simultaneously presents technical challenges.

Purpose of the Study:

• To demonstrate simultaneous ultra-high resolution OCT imaging at 840 nm and 1230 nm.
• To develop a free-space OCT setup supporting parallel dual-wavelength operation.
• To enhance image contrast and extract spectroscopic features using dual-wavelength OCT.

Main Methods:

• Utilized an off-the-shelf supercontinuum light source with spectral filtering to create a double-peak spectrum.
• Developed a free-space OCT system optimized for parallel 840 nm and 1230 nm imaging.
• Performed ex vivo and in vivo biological tissue imaging.

Main Results:

• Achieved axial resolutions of < 2 µm at 840 nm and < 4 µm at 1230 nm.
• Demonstrated simultaneous dual-wavelength OCT imaging with high power (>100 mW) and broad bandwidth (>200 nm) per band.
• Successfully extracted spectroscopic features with high spatial resolution.

Conclusions:

• Simultaneous dual-wavelength ultra-high resolution OCT is feasible using a supercontinuum source.
• The developed OCT system offers enhanced contrast and spectroscopic capabilities for biological tissue imaging.
• This technique holds promise for advanced biomedical imaging applications.