Head Access Laminar Optoelectric Neuroimaging System

This project develops a dense array fNIR/EEG neuroimaging system for use in operational environments. Miniature NIR-enhanced optical emitters and detectors are combined with EEG and EIT (Electrical Impedance Tomography) electrodes embedded in a novel,flexible and wireless, geodesic head web. This device integrates all interconnect for power and signal within the flexible geodesic tension structure, allowing comfortable and inobtrusive use while minimizing movement artifact. A novel phase changepolymer technology is introduced that optimizes coupling of both electrical and optical signals with the skin and scalp. An advance in miniature electronics will allow all amplification and signal processing to be worn on the head or body, allowing highbandwidth telemetry of dense array data on brain activity to the Cognitive Workload Assessment workstation. The initial design allows topographic reconstruction of both the hemodynamic (NIRS) and fast optical (EROS) signals, and it anticipates newalgorithms for tomographic reconstruction of brain activity throughout the head volume. This optoelectric neuroimaging system will allow comfortable acquisition of dense array data on brain activity from a gossamer, wireless web structure attached to the head. High bandwidth information on spatial and temporal components of human brainactivity can then be gathered with minimal interference in the routine behavior of the workplace. The soft flexible design allows use under a helmet while maintaining impact protection, and the resistance to movement artifact allows routine use with bothambulatory and supine patients in the medical setting.