This work introduces a polymer-free optode nanosensor for ratiometric sodium imaging. Transmembrane ion dynamics are often captured by electrophysiology and calcium imaging, but sodium dyes suffer from short excitation wavelengths and poor selectivity. Optodes, optical sensors composed of a polymer matrix with embedded sensing chemistry, have been translated into nanosensors that selectively im...

Optical topography is an emerging neuroimaging technique for the non-invasive monitoring of human cerebral haemodynamics. The technique is capable of localising brain activity if the positions and orientations of its network of optical sensing devices (optodes) are known relative to the anatomy of the human head. This paper describes the application of a photogrammetric network of low cost web-...