Development of large field-of-view two photon microscopy for imaging mouse cortex (Conference Presentation)

Jonathan Bumstead; Daniel C. Côté; Joseph P. Culver

doi:10.1117/12.2251433

24 April 2017 Development of large field-of-view two photon microscopy for imaging mouse cortex (Conference Presentation)

Jonathan Bumstead, Daniel C. Côté, Joseph P. Culver

Author Affiliations +

Proceedings Volume 10069, Multiphoton Microscopy in the Biomedical Sciences XVII; 100690F (2017) https://doi.org/10.1117/12.2251433
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

Spontaneous neuronal activity has been measured at cellular resolution in mice, zebrafish, and C. elegans using optical sectioning microscopy techniques, such as light sheet microscopy (LSM) and two photon microscopy (TPM). Recent improvements in these modalities and genetically encoded calcium indicators (GECI’s) have enabled whole brain imaging of calcium dynamics in zebrafish and C. elegans. However, these whole brain microscopy studies have not been extended to mice due to the limited field of view (FOV) of TPM and the cumbersome geometry of LSM. Conventional TPM is restricted to diffraction limited imaging over this small FOV (around 500 x 500 microns) due to the use of high magnification objectives (e.g. 1.0 NA; 20X) and the aberrations introduced by relay optics used in scanning the beam across the sample. To overcome these limitations, we have redesigned the entire optical path of the two photon microscope (scanning optics and objective lens) to support a field of view of Ø7 mm with relatively high spatial resolution (<10 microns). Using optical engineering software Zemax, we designed our system with commercially available optics that minimize astigmatism, field curvature, chromatic focal shift, and vignetting. Performance of the system was also tested experimentally with fluorescent beads in agarose, fixed samples, and in vivo structural imaging. Our large-FOV TPM provides a modality capable of studying distributed brain networks in mice at cellular resolution.

Conference Presentation

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Jonathan Bumstead, Daniel C. Côté, and Joseph P. Culver "Development of large field-of-view two photon microscopy for imaging mouse cortex (Conference Presentation)", Proc. SPIE 10069, Multiphoton Microscopy in the Biomedical Sciences XVII, 100690F (24 April 2017); https://doi.org/10.1117/12.2251433

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KEYWORDS

Microscopy

Two photon excitation microscopy

Brain

Calcium

Monochromatic aberrations

Objectives

Brain imaging

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