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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 16 — Aug. 11, 2014
  • pp: 19469–19483

Attenuation-corrected fluorescence spectra unmixing for spectroscopy and microscopy

Hayato Ikoma, Barmak Heshmat, Gordon Wetzstein, and Ramesh Raskar  »View Author Affiliations


Optics Express, Vol. 22, Issue 16, pp. 19469-19483 (2014)
http://dx.doi.org/10.1364/OE.22.019469


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Abstract

In fluorescence measurements, light is often absorbed and scattered by a sample both for excitation and emission, resulting in the measured spectra to be distorted. Conventional linear unmixing methods computationally separate overlapping spectra but do not account for these effects. We propose a new algorithm for fluorescence unmixing that accounts for the attenuation-related distortion effect on fluorescence spectra. Using a matrix representation, we derive forward measurement formation and a corresponding inverse method; the unmixing algorithm is based on nonnegative matrix factorization. We also demonstrate how this method can be extended to a higher-dimensional tensor form, which is useful for unmixing overlapping spectra observed under the attenuation effect in spectral imaging microscopy. We evaluate the proposed methods in simulation and experiments and show that it outperforms a conventional, linear unmixing method when absorption and scattering contributes to the measured signals, as in deep tissue imaging.

© 2014 Optical Society of America

OCIS Codes
(100.3190) Image processing : Inverse problems
(110.0180) Imaging systems : Microscopy
(170.2520) Medical optics and biotechnology : Fluorescence microscopy
(300.1030) Spectroscopy : Absorption
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

ToC Category:
Spectroscopy

History
Original Manuscript: June 9, 2014
Revised Manuscript: July 24, 2014
Manuscript Accepted: July 25, 2014
Published: August 5, 2014

Citation
Hayato Ikoma, Barmak Heshmat, Gordon Wetzstein, and Ramesh Raskar, "Attenuation-corrected fluorescence spectra unmixing for spectroscopy and microscopy," Opt. Express 22, 19469-19483 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-16-19469


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