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Spectroscopic thermo-elastic optical coherence tomography for tissue characterization.

Aaron Doug Deen1, Heleen M M Van Beusekom1, Tom Pfeiffer2

  • 1Department of Cardiology, Erasmus University Medical Center, P.O. Box 2040, Rotterdam 3000 CA, The Netherlands.

Biomedical Optics Express
|April 13, 2022
PubMed
Summary
This summary is machine-generated.

Spectroscopic Thermo-elastic Optical Coherence Tomography (TE-OCT) offers label-free, dual-contrast imaging for tissue identification. This technique analyzes optical reflectance and thermo-elastic deformation to detect biomarkers like lipids in atherosclerotic lesions.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Spectroscopy

Background:

  • Label-free optical imaging provides structural and biochemical information.
  • Existing techniques often require multimodal integration for enhanced contrast.
  • Thermo-elastic Optical Coherence Tomography (TE-OCT) offers dual contrast: optical reflectance and thermo-elastic deformation.

Purpose of the Study:

  • To demonstrate spectroscopic TE-OCT as a tool for tissue identification.
  • To characterize the relationship between thermo-elastic displacement and optical properties.
  • To extract and analyze thermo-elastic spectra for identifying specific tissue components.

Main Methods:

  • Utilized short laser pulses to induce thermo-elastic tissue deformation.
  • Employed phase-sensitive OCT to measure surface displacement.
  • Validated experimental results with a 2D analytical model.
  • Extracted thermo-elastic spectra from phantoms and coronary artery tissues.

Main Results:

  • Established a correlation between thermo-elastic displacement and optical absorption, excitation, fluence, and illumination area.
  • Successfully extracted thermo-elastic spectra of elastic phantoms and coronary artery tissue components.
  • Identified specific tissue components, notably lipids, through their unique spectral response.
  • Demonstrated the capability of spectroscopic TE-OCT to identify lipid biomarkers in atherosclerotic lesions.

Conclusions:

  • Spectroscopic TE-OCT is a promising label-free, dual-contrast, all-optical imaging technique.
  • The method enables identification of specific tissue components based on thermo-elastic spectral signatures.
  • TE-OCT holds potential for advancing biomedical research and clinical pathology diagnosis, particularly for atherosclerotic disease.