Wide-field in vivo neocortical calcium dye imaging using a convection-enhanced loading technique combined with simultaneous multiwavelength imaging of voltage-sensitive dyes and hemodynamic signals

Hongtao Ma; Samuel Harris; Redi Rahmani; Clay O. Lacefield; Mingrui Zhao; Andy G. Daniel; Zhiping Zhou; Randy M. Bruno; Jason Berwick; Theodore H. Schwartz

doi:10.1117/1.NPh.1.1.015003

24 July 2014 Wide-field in vivo neocortical calcium dye imaging using a convection-enhanced loading technique combined with simultaneous multiwavelength imaging of voltage-sensitive dyes and hemodynamic signals

Hongtao Ma, Samuel Harris, Redi Rahmani, Clay O. Lacefield, Mingrui Zhao, Andy G. Daniel, Zhiping Zhou, Randy M. Bruno, Jason Berwick, Theodore H. Schwartz

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Neurophotonics, Vol. 1, Issue 1, 015003 (July 2014). https://doi.org/10.1117/1.NPh.1.1.015003

Abstract

In vivo calcium imaging is an incredibly powerful technique that provides simultaneous information on fast neuronal events, such as action potentials and subthreshold synaptic activity, as well as slower events that occur in the glia and surrounding neuropil. Bulk-loading methods that involve multiple injections can be used for single-cell as well as wide-field imaging studies. However, multiple injections result in inhomogeneous loading as well as multiple sites of potential cortical injury. We used convection-enhanced delivery to create smooth, continuous loading of a large area of the cortical surface through a solitary injection site and demonstrated the efficacy of the technique using confocal microscopy imaging of single cells and physiological responses to single-trial events of spontaneous activity, somatosensory-evoked potentials, and epileptiform events. Combinations of calcium imaging with voltage-sensitive dye and intrinsic signal imaging demonstrate the utility of this technique in neurovascular coupling investigations. Convection-enhanced loading of calcium dyes may be a useful technique to advance the study of cortical processing when widespread loading of a wide-field imaging is required.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Hongtao Ma, Samuel Harris, Redi Rahmani, Clay O. Lacefield, Mingrui Zhao, Andy G. Daniel, Zhiping Zhou, Randy M. Bruno, Jason Berwick, and Theodore H. Schwartz "Wide-field in vivo neocortical calcium dye imaging using a convection-enhanced loading technique combined with simultaneous multiwavelength imaging of voltage-sensitive dyes and hemodynamic signals," Neurophotonics 1(1), 015003 (24 July 2014). https://doi.org/10.1117/1.NPh.1.1.015003

Published: 24 July 2014

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