Title :
Continuous current source inversion of evoked potential fields in a spherical model head
Author_Institution :
Southwestern Med. Center, Texas Univ., Dallas, TX, USA
Abstract :
This study explores the efficacy of a physiological constraint on cortical current generators in promoting a robust solution for the inverse problem in evoked potentials. It is proposed that the current sources responsible for the evoked potential be modeled as a set of dipoles oriented orthogonal to the surface of the cortex. Rather than using a minimum norm approach, the solution space is searched for a vector that minimizes the error of the predicted evoked potential scalp field.
Keywords :
bioelectric potentials; brain models; inverse problems; continuous current source inversion; cortex surface; error minimization; evoked potential fields; orthogonally oriented dipoles; physiological constraint efficacy; robust inverse problem solution; solution space; spherical model head; vector; Bioelectric phenomena; Blood flow; Brain modeling; Current density; Electric potential; Magnetic field measurement; Magnetic heads; Magnetic resonance imaging; Scalp; Space technology; Animals; Brain Mapping; Cerebral Cortex; Electrodes; Evoked Potentials; Humans; Models, Neurological; Predictive Value of Tests; Signal Processing, Computer-Assisted;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
