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Micromachined array tip for multifocus fiber-based optical coherence tomography.

Victor X D Yang1, Nigel Munce, Julius Pekar

  • 1Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2M9, Canada. victor.yang@utoronto.ca

Optics Letters
|September 9, 2004
PubMed
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We developed a novel multifocus fiber-based optical coherence tomography system. This system achieves high-resolution, real-time imaging over a large depth using a micromachined array tip.

Area of Science:

  • Biomedical Optics
  • Optical Engineering
  • Medical Imaging Technology

Background:

  • High-resolution optical coherence tomography (OCT) requires large detector bandwidth and high numerical aperture for real-time imaging.
  • Achieving high resolution and large imaging depth simultaneously in OCT presents significant technical challenges.

Purpose of the Study:

  • To propose and demonstrate a novel multifocus fiber-based OCT system.
  • To overcome the conflicting requirements of large detector bandwidth and high numerical aperture for deep-tissue, real-time OCT imaging.

Main Methods:

  • Fabrication of a prototype four-channel micromachined array tip.
  • Utilizing a four-channel cascaded Michelson fiber-optic interferometer.
  • Simultaneous scanning at 8 kHz with geometric power distribution across channels.

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Main Results:

  • The prototype tip maintained a 9-14-microm spot diameter.
  • Achieved an imaging depth exceeding 500 microm.
  • Successfully obtained images of a resolution target and a human tooth.

Conclusions:

  • The developed multifocus fiber-based OCT system effectively addresses the challenges of high-resolution, real-time imaging at depth.
  • The micromachined array tip enables simultaneous multifocus imaging, enhancing OCT capabilities.