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Current density and electrical conductivity imaging research at the University of Toronto is reviewed. Methods for imaging live animals at low frequency are described and contrasted with EIT and other MRI based techniques. New work on imaging at radio frequencies is presented and future work directions are discussed. It is concluded that low frequency methods are mature and ready for application in...
Current density imaging (CDI) is a magnetic resonance imaging (MRI) technique used to quantitatively measure current density vectors throughout the volume of an object/subject placed in the MRI system. Electrical current pulses are applied externally to the object/subject and are synchronized with the MRI sequence. In this work, CDI is used to measure average current density magnitude in the torso...
Radio-frequency current density imaging (RF-CDI) is an imaging technique that noninvasively measures current density distribution at the Larmor frequency utilizing magnetic resonance imaging (MRI). Previously implemented RF-CDI techniques were only able to image a single slice transverse to the static magnetic field B0 . This paper describes the first realization of a multislice RF-CDI sequence on...
The authors have applied finite-element computer models to electrode design problems in defibrillation, external cardiac pacing, and electrosurgery. These models solve Laplace's equation to determine voltage and current density distribution throughout the body and electrodes. The models are flexible (easily modified) and have proved to be an effective tool in evaluating electrodes, predicting their...
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