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Journal of Biomedical Optics

Strategies to overcome photobleaching in algorithm-based adaptive optics for nonlinear in-vivo imaging
Author(s): M. Caroline Müllenbroich; Ewan J. McGhee; Amanda J. Wright; Kurt I. Anderson; Keith Mathieson
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Paper Abstract

We have developed a nonlinear adaptive optics microscope utilizing a deformable membrane mirror (DMM) and demonstrated its use in compensating for system- and sample-induced aberrations. The optimum shape of the DMM was determined with a random search algorithm optimizing on either two photon fluorescence or second harmonic signals as merit factors. We present here several strategies to overcome photobleaching issues associated with lengthy optimization routines by adapting the search algorithm and the experimental methodology. Optimizations were performed on extrinsic fluorescent dyes, fluorescent beads loaded into organotypic tissue cultures and the intrinsic second harmonic signal of these cultures. We validate the approach of using these preoptimized mirror shapes to compile a robust look-up table that can be applied for imaging over several days and through a variety of tissues. In this way, the photon exposure to the fluorescent cells under investigation is limited to imaging. Using our look-up table approach, we show signal intensity improvement factors ranging from 1.7 to 4.1 in organotypic tissue cultures and freshly excised mouse tissue. Imaging zebrafish in vivo, we demonstrate signal improvement by a factor of 2. This methodology is easily reproducible and could be applied to many photon starved experiments, for example fluorescent life time imaging, or when photobleaching is a concern.

Paper Details

Date Published: 27 January 2014
PDF: 12 pages
J. Biomed. Opt. 19(1) 016021 doi: 10.1117/1.JBO.19.1.016021
Published in: Journal of Biomedical Optics Volume 19, Issue 1
Show Author Affiliations
M. Caroline Müllenbroich, Univ. of Strathclyde (United Kingdom)
Ewan J. McGhee, The Beatson Institute for Cancer Research (United Kingdom)
Amanda J. Wright, The Univ. of Nottingham (United Kingdom)
Kurt I. Anderson, The Beatson Institute for Cancer Research (United Kingdom)
Keith Mathieson, Univ. of Strathclyde (United Kingdom)


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