Non-invasive topographic localization of glymphatic flow
A computer-implemented method and system includes accessing neurophysiological and neurovascular data recorded during sleep. A device mounted on a subject's head during sleep can gather neurovascular data by measuring transcranial impedance. The device can be in the form of a single band, multiple bands, or a headcap that are worn on the subject's head. Electrodes located along an inner surface of the wearable device contact the subject's head and measure transcranial impedance. Transcranial impedance measurements are gathered from multiple locations on the subject's head and over multiple frequencies to obtain a more complete assessment of glymphatic flow.
1. A device for topographic localization of glymphatic flow, the device comprising:
a headcap configured to be worn on top of a head of a subject, the headcap comprising left electrodes and right electrodes, wherein the left electrodes and the right electrodes are multiplexed to gather passive EEG signals and responsive electrical potential data; and
a controller coupled to the headcap, the controller comprising a processor and a power source that are electrically coupled to the left electrodes and the right electrodes;
wherein at least one electrode of the left electrodes and the right electrodes is an input electrode that provides input currents over a range of frequencies that are generated by the power source and wherein other electrodes of the left electrodes and the right electrodes measure the responsive electrical potential data in response to the input currents, and
wherein the device is configured to provide an indication of a change in the glymphatic flow that is localized to the left electrodes and the right electrodes by deriving left impedance data and right impedance data from the responsive electrical potential data over time.
2. The device of claim 1 , wherein the device generates a topographic image on an output interface, the topographic image showing a change in glymphatic flow based upon left impedance data and right impedance data derived from the responsive electrical potential data.
3. The device of claim 1 , wherein the controller changes the input electrode from the at least one electrode to a different electrode among the left electrodes and the right electrodes thereby generating additional responsive electrical potential data.
4. The device of claim 3 , wherein the device combines the responsive electrical potential data and the additional responsive electrical potential data into a topographic representation of changes in the glymphatic flow.
5. The device of claim 3 , wherein a processor applies a prediction model to the responsive electrical potential data and the additional responsive electrical potential data gathered from multiple input electrode configurations and generates a topographic representation of changes in the glymphatic flow.
6. The device of claim 1 , wherein the left impedance data and the right impedance data derived from the responsive electrical potential data over time is derived by determining equipotential surfaces extending from the left electrodes to the right electrodes.
7. The device of claim 6 , wherein the input electrode is coupled with a sink electrode, the sink electrode located on an opposite side of the head of the subject from the input electrode.