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Ouzounov, D. G.

Publications and source records attributed to Ouzounov, D. G..

2 recordsLinked to original sources
bioRxiv2026

Three photon microscopy of mouse brain structure and function at 2 mm depth and beyond

High-resolution noninvasive imaging of neuronal activity at single-cell resolution deep within brain tissue is essential for understanding brain function and disease. Here we show that an improved 1300-nm three-photon microscope for maximal excitation and collection efficiency enables imaging up to the three-photon depth limit in the intact mouse brain. Our platform achieves structural imaging of brain vasculature at depths up to 2.5 mm and functional imaging of neural activities at depths up to 2 mm, reaching deep brain regions previously inaccessible by multiphoton imaging. These advances extend the frontier of deep-tissue functional imaging and open new possibilities for longitudinal and mechanistic studies in neuroscience and beyond.

bioengineering↗
bioRxiv2019

Quantitative analysis of 1300-nm three-photon calcium imaging in the mouse brain

1300-nm three-photon calcium imaging has emerged as a useful technique to allow calcium imaging in deep brain regions. Application to large-scale neural activity imaging entails a careful balance between recording fidelity and tissue heating. We calculated and experimentally verified the excitation pulse energy to achieve the minimum photon count required for the detection of calcium transients in GCaMP6s-expressing neurons for 920-nm two-photon and 1320-nm three-photon excitation, respectively. Brain tissue heating by continuous three-photon imaging was simulated with Monte Carlo method and experimentally validated with immunohistochemistry. We observed increased immunoreactivity with 150 mW excitation power at 1.0- and 1.2-mm imaging depths. Based on the data, we explained how three-photon excitation achieves better calcium imaging fidelity than two-photon excitation in the deep brain and quantified the imaging depth where three-photon microscopy should be applied. Our analysis presents a translatable model for the optimization of three-photon calcium imaging based on experimentally tractable parameters.

neuroscience↗