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Ultrahigh-sensitive optical coherence elastography.

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Summary
This summary is machine-generated.

We developed a common-path optical coherence elastography (OCE) system using swept-source OCT (SS-OCECP). This system achieves high phase stability for precise elasticity measurements, detecting displacements as small as 300 pm.

Keywords:
BiophotonicsOptical techniques

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Optical Coherence Tomography

Background:

  • Phase stability is crucial for accurate elasticity measurements in optical coherence elastography (OCE).
  • Factors like SNR, timing jitters, and optical path difference (OPD) fluctuations can degrade phase stability.
  • Conventional SS-OCE systems often require external stabilization or extensive post-processing.

Purpose of the Study:

  • To develop a novel common-path swept-source OCE (SS-OCECP) system with enhanced phase stability.
  • To achieve high-precision elasticity measurements by minimizing phase noise and OPD variations.
  • To demonstrate the system's capability for detecting minute displacements.

Main Methods:

  • Integrated a common-path interferometer using a 3-mm wedged window into an SS-OCT system.
  • Optimized electrical components to minimize timing jitters and prevent signal acquisition issues.
  • Utilized a high-speed waveform digitizer and a high-bandwidth balanced photodetector for signal processing.

Main Results:

  • Achieved a phase stability of 4.2 mrad without external stabilization or averaging.
  • Demonstrated the capability to detect displacements as small as approximately 300 pm.
  • Validated performance in a tissue-mimicking phantom and an in vivo rabbit model, showing improved stability over conventional SS-OCE.

Conclusions:

  • The developed SS-OCECP system offers intrinsic compensation for polarization and dispersion mismatch.
  • The system significantly minimizes phase fluctuations caused by OPD variations.
  • This SS-OCECP technology represents a breakthrough in high-phase stability for improved elastography sensitivity.