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High-accuracy optical coherence elastography digital volume correlation methods to measure depth regions with low

Xianglong Lin1,2, Jinlong Chen1,2, Cuiru Sun1,2

  • 1Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin, China.

Journal of Biophotonics
|September 29, 2023
PubMed
Summary

This study introduces an enhanced optical coherence elastography (OCE) method using digital volume correlation (DVC) to improve deep tissue deformation measurement. The novel approach significantly increases depth penetration and measurement accuracy for biological tissues.

Keywords:
deformation characterization in deep regionsdigital volume correlationoptical coherence elastographyreliability layer guided displacement tracking strategy

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Area of Science:

  • Biomedical Engineering
  • Optical Imaging
  • Biophysics

Background:

  • Optical coherence tomography (OCT) struggles with depth-dependent signal correlation, limiting digital volume correlation (DVC) in optical coherence elastography (OCE).
  • Accurate measurement of deep tissue deformation is crucial for understanding various biological processes and diseases.

Purpose of the Study:

  • To develop an improved OCE-DVC method for characterizing biological tissue deformation in deeper regions.
  • To overcome the depth limitations of current OCT-based elastography techniques.

Main Methods:

  • Proposed a reliability layer guided displacement tracking strategy for OCE-DVC.
  • Implemented parallel computing and layer-by-layer adaptive data reading for high-resolution OCT image processing.
  • Applied the OCE-DVC method to quantify displacement and strain in deep tissue regions.

Main Results:

  • Nearly doubled the depth of quantitative characterization for displacement and strain.
  • Reduced the standard deviation of displacement and strain measurements by approximately 78% at increased depth.
  • Successfully tracked displacement with large strain gradients in deep, nonuniformly deforming tissue.

Conclusions:

  • The proposed OCE-DVC method enhances quantitative characterization of deep tissue biomechanics.
  • The method offers improved accuracy and depth penetration compared to conventional techniques.
  • This advancement has significant implications for in-vivo tissue analysis and disease diagnosis.