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Doppler Optical Coherence Tomography of Retinal Circulation
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Published on: September 18, 2012

Phase-resolved Doppler optical coherence tomography--limitations and improvements.

Anna Szkulmowska1, Maciej Szkulmowski, Andrzej Kowalczyk

  • 1Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, PL-87-100 Torun, Poland.

Optics Letters
|July 3, 2008
PubMed
Summary

Simple phase averaging in Fourier domain optical coherence tomography (FdOCT) causes velocity bias. We present an improved data processing method to achieve accurate velocity measurements in biological samples.

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Ophthalmology

Background:

  • Phase-resolved Fourier domain optical coherence tomography (FdOCT) is a key technology for non-invasive blood flow assessment.
  • Standard velocity estimation methods in FdOCT can be prone to systematic bias.
  • Accurate velocity measurements are crucial for diagnosing and monitoring various vascular conditions.

Purpose of the Study:

  • To identify and explain the source of systematic bias in velocity estimation using standard phase-resolved FdOCT.
  • To develop and demonstrate an improved data processing technique for accurate velocity measurements.
  • To validate the enhanced technique against established methods in diverse biological models.

Main Methods:

  • Analysis of phase difference averaging in FdOCT velocity estimation.
  • Development of a corrected data processing algorithm for FdOCT.
  • Experimental validation using flow measurements in glass capillaries and human retinal vessels.
  • Comparative analysis with standard phase-resolved FdOCT techniques.

Main Results:

  • The study identified systematic velocity bias stemming from simple phase difference averaging in FdOCT.
  • The magnitude of this bias is influenced by signal-to-noise ratio and proximity to velocity range limits.
  • The improved processing method successfully eliminated velocity bias, yielding accurate measurements.
  • Validation confirmed the effectiveness of the new technique in glass capillaries and human retinal vessels.

Conclusions:

  • Standard phase difference averaging in FdOCT introduces a significant bias in velocity estimations.
  • A corrected data processing approach is essential for accurate FdOCT velocity measurements.
  • The validated technique offers a reliable method for quantifying blood flow velocity in biomedical applications.