title: Electrical impedance as a locating method in human stereotactic surgery.
abstract: During stereotactic surgery, electrical impedance was measured by means of a roving electrode technique with a sine wave current of 10 kc. Impedance showed a characteristic decrease when the electrode was passing through the thalamus and consequently the impedance profile corresponding to the thalamic area exhibited the characteristic shape of a 'frying pan'. By observing the impedance, it is possible to differentiate the thalamic gray matter from the surrounding structures with some accuracy.
mesh_terms: D000818:Animals; D001931:Brain Mapping / Q000379:methods; D002415:Cats; D004553:Electric Conductivity; D006801:Humans; D009069:Movement Disorders / Q000601:surgery*; D013238:Stereotaxic Techniques; D013788:Thalamus / Q000033:anatomy & histology* / Q000601:surgery