Prof. Igor Serša: Magnetic Resonance Electric Current Density Imaging
Source: Monday physics colloquium
Magnetic Resonance Electric Current Density Imaging
Prof. Igor Serša
Faculty of Mathematics and Physics, University of Ljubljana & J. Stefan Institute, Ljubljana
Magnetic resonance imaging (MRI) developed from its discovery four decades ago into one of standard radiological modalities and also became an important technique in analysis of various processes in natural sciences. This was possible also due to its unique ability of encoding different physical quantities into signal’s phase. In this lecture, it will be shown how electric currents can be imaged by MRI based on their effect on the static magnetic field change and consequently on the change of MRI signal’s phase. The method utilizes a special current density imaging (CDI) sequence that triggers electric currents through a conductive sample in pulses synchronously with the CDI pulse sequence. Results of the sequence are phase shift maps that are then used to calculate current density in the sample and can also be used to calculate conductive properties of the sample. Introduction to basic principles of the CDI method will be followed by use of CDI in attempts to image brain activity and in its use to monitor electric field during the delivery of high-voltage electric pulses in electroporation.