Imaging fascicular organization of rat sciatic nerves with fast neural electrical impedance tomography.

Abstract:

:Imaging compound action potentials (CAPs) in peripheral nerves could help avoid side effects in neuromodulation by selective stimulation of identified fascicles. Existing methods have low resolution, limited imaging depth, or are invasive. Fast neural electrical impedance tomography (EIT) allows fascicular CAP imaging with a resolution of <200 µm, <1 ms using a non-penetrating flexible nerve cuff electrode array. Here, we validate EIT imaging in rat sciatic nerve by comparison to micro-computed tomography (microCT) and histology with fluorescent dextran tracers. With EIT, there are reproducible localized changes in tissue impedance in response to stimulation of individual fascicles (tibial, peroneal and sural). The reconstructed EIT images correspond to microCT scans and histology, with significant separation between the fascicles (p < 0.01). The mean fascicle position is identified with an accuracy of 6% of nerve diameter. This suggests fast neural EIT can reliably image the functional fascicular anatomy of the nerves and so aid selective neuromodulation.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ravagli E,Mastitskaya S,Thompson N,Iacoviello F,Shearing PR,Perkins J,Gourine AV,Aristovich K,Holder D

doi

10.1038/s41467-020-20127-x

subject

Has Abstract

pub_date

2020-12-07 00:00:00

pages

6241

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20127-x

journal_volume

11

pub_type

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