Table 2.

Non-invasive biometric devices for large vessel occlusion detection

Technology	Description
Electroencephalography (EEG)	Electrodes adhered to scalp monitor cerebral electrical activity
Somatosensory evoked potentials (SSEP)	Electrical signals in the brain generated by sensory stimuli in a peripheral nerve; sensory cortex is supplied by middle cerebral artery
Transcranial Doppler (TCD)	Monitors cerebral hemodynamics via pulsed Doppler ultrasound transducer to assess intracranial blood flow
Cranial accelerometry	Subtle head oscillations associated with cardiac contraction measured by accelerometers on headband and electrocardiogram leads
Volumetric impedance phase-shift spectroscopy	Passage of low-power electromagnetic waves through the brain to detect asymmetries in electrical properties