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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 10 — Oct. 31, 2007

Multifocal multiphoton microscopy based on multianode photomultiplier tubes

Ki Hean Kim, Christof Buehler, Karsten Bahlmann, Timothy Ragan, Wei-Chung A. Lee, Elly Nedivi, Erica L. Heffer, Sergio Fantini, and Peter T. C. So  »View Author Affiliations


Optics Express, Vol. 15, Issue 18, pp. 11658-11678 (2007)
http://dx.doi.org/10.1364/OE.15.011658


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Abstract

Multifocal multiphoton microscopy (MMM) enhances imaging speed by parallelization. It is not well understood why the imaging depth of MMM is significantly shorter than conventional single-focus multiphoton microscopy (SMM). In this report, we show that the need for spatially resolved detectors in MMM results in a system that is more sensitive to the scattering of emission photons with reduced imaging depth. For imaging depths down to twice the scattering mean free path length of emission photons (2×lems), the emission point spread function (PSFem) is found to consist of a narrow, diffraction limited distribution from ballistic emission photons and a broad, relatively low amplitude distribution from scattered photons. Since the scattered photon distribution is approximately 100 times wider than that of the unscattered photons at 2×lems, image contrast and depth are degraded without compromising resolution. To overcome the imaging depth limitation of MMM, we present a new design that replaces CCD cameras with multi-anode photomultiplier tubes (MAPMTs) allowing more efficient collection of scattered emission photons. We demonstrate that MAPMT-based MMM has imaging depth comparable to SMM with equivalent sensitivity by imaging tissue phantoms, ex vivo human skin specimens based on endogenous fluorophores, and green fluorescent protein (GFP) expressing neurons in mouse brain slices.

© 2007 Optical Society of America

OCIS Codes
(180.2520) Microscopy : Fluorescence microscopy
(180.5810) Microscopy : Scanning microscopy
(180.6900) Microscopy : Three-dimensional microscopy
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:
Microscopy

History
Original Manuscript: March 28, 2007
Revised Manuscript: August 15, 2007
Manuscript Accepted: August 15, 2007
Published: August 29, 2007

Virtual Issues
Vol. 2, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Ki Hean Kim, Christof Buehler, Karsten Bahlmann, Timothy Ragan, Wei-Chung A. Lee, Elly Nedivi, Erica L. Heffer, Sergio Fantini, and Peter T. C. So, "Multifocal multiphoton microscopy based on multianode photomultiplier tubes," Opt. Express 15, 11658-11678 (2007)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-15-18-11658


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