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Interstitial Doppler optical coherence tomography.

Victor X D Yang1, You X Mao, Nigel Munce

  • 1University Health Network, Toronto, Ontario, Canada. victor.yang@utoronto.ca

Optics Letters
|August 12, 2005
PubMed
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A new needle-based Doppler optical coherence tomography (OCT) system images deep tissue microcirculation. This breakthrough visualizes bidirectional blood flow in vivo, advancing interstitial imaging capabilities.

Area of Science:

  • Biomedical Engineering
  • Optical Imaging
  • Microcirculation Research

Background:

  • Doppler optical coherence tomography (OCT) offers high-resolution imaging of tissue structure and blood flow.
  • Current Doppler OCT systems face limitations in imaging depth, restricting visualization of deeper microvasculature.

Purpose of the Study:

  • To develop and demonstrate a novel needle-based Doppler OCT system for enhanced interstitial imaging.
  • To overcome the depth limitations of conventional Doppler OCT for visualizing deep microcirculation.

Main Methods:

  • A linear-scanning, needle-based Doppler OCT system was engineered using angle-polished gradient-index or ball-lensed fibers.
  • A prototype system incorporated a 19-gauge (approx. 0.9 mm diameter) echogenic needle for in vivo imaging.

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Main Results:

  • The system successfully achieved in vivo imaging of bidirectional blood flow within rat leg and abdominal cavities.
  • This represents the first reported use of Doppler OCT via a needle probe for interstitial applications.

Conclusions:

  • The developed needle-based Doppler OCT system enables visualization of deeply situated microcirculation.
  • This technology holds significant potential for advancing interstitial diagnostic and research applications.