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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 5, Iss. 6 — Jun. 1, 2014
  • pp: 1709–1720

Modulated-alignment dual-axis (MAD) confocal microscopy for deep optical sectioning in tissues

Steven Y. Leigh, Ye Chen, and Jonathan T.C. Liu  »View Author Affiliations


Biomedical Optics Express, Vol. 5, Issue 6, pp. 1709-1720 (2014)
http://dx.doi.org/10.1364/BOE.5.001709


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Abstract

A strategy is presented to enable optical-sectioning microscopy with improved contrast and imaging depth using low-power (0.5 - 1 mW) diode laser illumination. This technology combines the inherent strengths of focal-modulation microscopy and dual-axis confocal (DAC) microscopy for rejecting out-of-focus and multiply scattered background light in tissues. The DAC architecture is unique in that it utilizes an intersecting pair of illumination and collection beams to improve the spatial-filtering and optical-sectioning performance of confocal microscopy while focal modulation selectively ‘labels’ in-focus signals via amplitude modulation. Simulations indicate that modulating the spatial alignment of dual-axis beams at a frequency f generates signals from the focal volume of the microscope that are modulated at 2f with minimal modulation of background signals, thus providing nearly an order-of-magnitude improvement in optical-sectioning contrast compared to DAC microscopy alone. Experiments show that 2f lock-in detection enhances contrast and imaging depth within scattering phantoms and fresh tissues.

© 2014 Optical Society of America

OCIS Codes
(170.1790) Medical optics and biotechnology : Confocal microscopy
(170.2520) Medical optics and biotechnology : Fluorescence microscopy
(170.4090) Medical optics and biotechnology : Modulation techniques
(170.5810) Medical optics and biotechnology : Scanning microscopy
(230.1040) Optical devices : Acousto-optical devices
(110.0113) Imaging systems : Imaging through turbid media

ToC Category:
Microscopy

History
Original Manuscript: March 13, 2014
Revised Manuscript: April 25, 2014
Manuscript Accepted: April 25, 2014
Published: April 30, 2014

Citation
Steven Y. Leigh, Ye Chen, and Jonathan T.C. Liu, "Modulated-alignment dual-axis (MAD) confocal microscopy for deep optical sectioning in tissues," Biomed. Opt. Express 5, 1709-1720 (2014)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-5-6-1709


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