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Depth resolved hyperspectral imaging spectrometer based on structured light illumination and Fourier transform

Heejin Choi1, Dushan Wadduwage2, Paul T Matsudaira3

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Biomedical Optics Express
|November 1, 2014
PubMed
Summary

This study introduces a novel hyperspectral imaging spectrometer achieving depth-resolved spectral imaging. The system utilizes a Sagnac interferometer and structured illumination for precise 3D spectral analysis of biological samples.

Keywords:
(170.2520) Fluorescence microscopy(170.6900) Three-dimensional microscopy(300.6300) Spectroscopy, Fourier transforms

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Area of Science:

  • Optical Imaging
  • Spectroscopy
  • Biophotonics

Background:

  • Standard imaging spectrometers lack depth resolution.
  • Hyperspectral imaging provides spectral information but often in 2D.
  • Depth-resolved spectral data is crucial for analyzing complex biological structures.

Purpose of the Study:

  • To develop a hyperspectral imaging spectrometer with depth resolution.
  • To enable 3D spectral analysis of biological specimens.
  • To validate the system's performance using in vitro and biological samples.

Main Methods:

  • Utilized a Sagnac interferometer for spectral cube acquisition.
  • Employed structured illumination and the HiLo algorithm for depth recovery.
  • Post-processed spectral data (x, y, λ) to achieve depth resolution.
  • Validated with fluorescent solutions, beads, and biological tissues.

Main Results:

  • Achieved depth resolution of 1.8 μm.
  • Demonstrated spectral resolution of 7 nm.
  • Successfully quantified spectra from 3D resolved features in biological specimens.
  • Validated the system's capability for depth-resolved hyperspectral imaging.

Conclusions:

  • The developed hyperspectral imaging spectrometer effectively provides depth-resolved spectral information.
  • The system enables precise spectral analysis of 3D biological structures.
  • This technique advances optical imaging for biological and spectral applications.