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April 2nd, 2025
Version: 2
Imperial College London
bioengineering
biorxiv

Light-field deep learning enables high-throughput, scattering-mitigated calcium imaging

Howe, C. L.Open in Google Scholar•Zhao, K. L. Y.Open in Google Scholar•Verinaz-Jadan, H.Open in Google Scholar•Song, P.Open in Google Scholar•Barnes, S. J.Open in Google Scholar•Dragotti, P. L.Open in Google Scholar•Foust, A. J.Open in Google Scholar

Light field microscopy (LFM) enables volumetric, high throughput functional imaging. However, the computational burden and vulnerability to scattering limit LFM's application to neuroscience. We present a light-field strategy for volumetric, scattering-mitigated neural circuit activity monitoring. A physics-based deep neural network, LNet, is trained with two-photon volumes and one-photon light fields. A processing pipeline uses LNet to extract calcium activity from light-field videos of jGCaMP8f-expressing neurons in acute cortical slices. The extracted time series have high signal-to-noise ratios and reduced optical crosstalk compared to conventional volume reconstruction methods. Imaging 100 volumes per second, we observe putative spikes fired at up to 10 Hz and the spatial intermingling of putative ensembles throughout 530 x 530 x 100-micron volumes. Compared to iterative algorithms, LNet workflows reduce light-field video processing times by 2- to 12-fold, advancing the goal of real-time, scattering-robust volumetric neural circuit imaging for closed-loop and adaptive experimental paradigms.

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