Catheter based instrument for simultaneous OCT imaging and fluorescence spectroscopy

Francisco Guzman, Jennifer Kehlet Barton

Research output: Contribution to journalConference articlepeer-review


We have developed an imaging device that provides cross-sectional imaging as well as fluorescence spectroscopy. The first application of this device is to differentiate healthy arterial wall from atherosclerotic plaque. Optical coherence tomography (OCT) provides two-dimensional imaging. OCT images have an imaging length and depth of 1-2 millimeters and 15 micron resolution. Laser induced fluorescence (LW) spectroscopy provides histochemical information. Due to high absorption of excitation wavelengths the fluorescence spectra is integrated from tissue only 200 microns deep. The OCT portion of the device is based on a Michelson interferometer. A superluminescent diode provides light at 1300 nm with 49 nm spectral width, and a galvanometer mounted retroreflector allows the reference arm length to be modulated. A helium cadmium laser provides the excitation source with wavelengths of 325 and 442 nm. In one instrument design, a series of dichroic mirrors is used to combine light from the OCT and LIF systems. In another design, OCT, excitation and emission fibers are combined into the same custom-built catheter for the delivery and collection of light. Preliminary data show that OCT images and LIF spectra give complementary information from normal and atherosclerotic portions of arterial wall.

Original languageEnglish (US)
Pages (from-to)430-437
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
EventLasers in Surgery: Advanced Characterization, Therapeutics, and Systems XII - San Jose, CA, United States
Duration: Jan 19 2002Jan 22 2002


  • Aorta
  • Atheroselerosis
  • He:Cd laser
  • Optical coherence tomography
  • Vessel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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