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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 11 — Apr. 10, 2007
  • pp: 2123–2130

Near-infrared laser tomographic imaging with right-angled scattered coherent light using an optical heterodyne-detection-based confocal scanning system

Izumi Nishidate, Masaki Goto, Yoshiaki Sasaki, Tetsuya Yuasa, Balasigamani Devaraj, Kyuichi Niizeki, and Takao Akatsuka  »View Author Affiliations


Applied Optics, Vol. 46, Issue 11, pp. 2123-2130 (2007)
http://dx.doi.org/10.1364/AO.46.002123


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Abstract

We demonstrate, what is to the best of our knowledge, a novel optical tomographic method for the visualization of the inner structure of scattering media such as biological tissue in the near-infrared region. We constructed a scanning confocal imaging system with a cross-axes arrangement using optical fibers. This system is based on the optical heterodyne technique and enables the detection of very weak coherence photons that are generated in the spatially restricted confocal region and scattered laterally (90°) against an incident beam. To evaluate the fundamental imaging capabilities of the system, we assessed measurements from scattering phantoms composed of an Intralipid suspension with varying volume concentrations. The results of this study demonstrate that the right-angled scattered light adheres to the Lambert–Beer law and that the present system can detect light propagating through a distance of 31 l of the mean free path. An inclusion as small as 100   μm can be discriminated in a scattering media with an optical thickness of 4. We investigated the potential of the proposed system for imaging biological tissues in preliminary experiments using samples of chicken breast tissue.

© 2007 Optical Society of America

OCIS Codes
(110.1650) Imaging systems : Coherence imaging
(110.6960) Imaging systems : Tomography
(170.0110) Medical optics and biotechnology : Imaging systems
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6960) Medical optics and biotechnology : Tomography

ToC Category:
Imaging Systems

History
Original Manuscript: June 13, 2006
Revised Manuscript: October 23, 2006
Manuscript Accepted: November 11, 2006
Published: March 20, 2007

Virtual Issues
Vol. 2, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Izumi Nishidate, Masaki Goto, Yoshiaki Sasaki, Tetsuya Yuasa, Balasigamani Devaraj, Kyuichi Niizeki, and Takao Akatsuka, "Near-infrared laser tomographic imaging with right-angled scattered coherent light using an optical heterodyne-detection-based confocal scanning system," Appl. Opt. 46, 2123-2130 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-11-2123

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