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Multimodal Imaging and Spectroscopy Fiber-bundle Microendoscopy Platform for Non-invasive, In Vivo Tissue Analysis
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Microscope objective based 4π spectroscopic tissue scattering goniometry.

Z J Simmons1,2, J D Rogers1,2

  • 1Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Drive, Madison, WI 53706, USA.

Biomedical Optics Express
|September 1, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces an advanced goniometry technique for rapid, comprehensive optical scattering measurements of tissues. The method enhances understanding of tissue optical properties and scattering behavior.

Keywords:
(120.5820) Scattering measurements(170.3660) Light propagation in tissues(170.6935) Tissue characterization

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Area of Science:

  • Biomedical Optics
  • Tissue Optics
  • Light Scattering

Background:

  • Optical scattering measurements provide critical information about tissue structure and composition.
  • Goniometry is a key technique for characterizing light scattering.
  • Existing methods may have limitations in angular range or speed.

Purpose of the Study:

  • To develop and validate an advanced goniometry system for comprehensive optical scattering analysis of tissues.
  • To enable rapid characterization of the full scattering phase function.
  • To investigate wavelength-dependent scattering properties.

Main Methods:

  • Utilizes a dual-microscope objective configuration with off-axis illumination.
  • Measures intensity profiles at pupil planes to extend observable scattering angles.
  • Incorporates a spectrally tunable source for wavelength-dependent measurements.

Main Results:

  • The instrument rapidly measures scattering into 4π steradians, characterizing isotropic and anisotropic tissues.
  • Demonstrates sensitivity to axially asymmetric scattering and allows selective interrogation of inhomogeneous regions.
  • Concurrent measurement of scattering coefficient (μ) and validation against Mie theory for microsphere suspensions.

Conclusions:

  • The developed goniometry technique offers a powerful tool for detailed optical characterization of various tissue types.
  • Enables rapid, comprehensive analysis of scattering properties, including anisotropy and wavelength dependence.
  • Validated with biological tissues (rat brain, mouse eye), showing potential for diverse biomedical applications.