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Micron-scale hysteresis measurement using dynamic optical coherence elastography.

Wenjie Li1,2, Jinping Feng3,2, Yicheng Wang1

  • 1Foshan University, School of Mechatronic Engineering and Automation, Foshan, Guangdong, 528000, China.

Biomedical Optics Express
|July 1, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a new optical coherence elastography (OCE) technique to measure soft tissue mechanical hysteresis using air pulses. This non-contact method quantifies viscoelasticity, distinguishing tissue types by their energy dissipation.

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Area of Science:

  • Biomedical Engineering
  • Biophysics
  • Materials Science

Background:

  • Assessing soft tissue mechanical properties is crucial for disease diagnosis and treatment monitoring.
  • Current methods for characterizing tissue viscoelasticity can be invasive or lack precision.
  • Optical Coherence Elastography (OCE) offers a non-invasive approach to probe tissue mechanics.

Purpose of the Study:

  • To develop and validate a novel non-contact optical coherence elastography (OCE) method for quantifying soft tissue mechanical hysteresis.
  • To investigate the relationship between energy dissipation, loading parameters, and tissue type.
  • To demonstrate the potential of OCE for differentiating tissue components and guiding clinical applications.

Main Methods:

  • A novel OCE technique utilizing transient, low-pressure air-pulse stimulation and micrometer-scale displacement measurement.
  • Quantification of sample hysteresis as an energy dissipation rate (loss ratio).
  • Testing of soft-tissue phantoms and beef shank samples under varying loading conditions; validation with finite element analysis and mechanical testing.

Main Results:

  • The developed OCE method successfully quantified sample hysteresis, defined as the loss ratio, for various soft tissues.
  • Sample hysteresis was primarily influenced by the unloading response and decreased with increasing loading energy.
  • OCE measurements enabled differentiation of tissue types and components (muscle vs. connective tissue) based on displacement and hysteresis features.

Conclusions:

  • The novel, non-contact OCE method effectively quantifies soft tissue viscoelasticity through micron-scale displacement dynamics and hysteresis measurements.
  • This approach has the potential to differentiate soft tissues and provide clinically relevant metrics for disease diagnosis and treatment response.
  • Focal tissue hysteresis measurements offer a promising new avenue for non-invasive biomedical assessments.