Electrical conductivity imaging using magnetic resonance tomography.

Area of Science:

• Biophysics
• Medical Imaging
• Electrical Engineering

Background:

• Electrical conductivity of human tissue is a valuable parameter for diagnostics and predicting Specific Absorption Rate (SAR) during Magnetic Resonance (MR) measurements.
• Current methods for measuring tissue conductivity may be invasive or complex.

Purpose of the Study:

• To apply and validate the Electric Properties Tomography (EPT) approach for non-invasively deriving patient electrical conductivity using a standard MR system.
• To demonstrate the feasibility of EPT through phantom experiments and initial in-vivo brain measurements.

Main Methods:

• EPT utilizes the spatial transmit sensitivity distribution of the RF coil, measured by the MR system.
• This distribution is post-processed using Faraday's and Ampere's laws to estimate electrical conductivity.
• The method avoids the need for external electrodes, currents, or RF probes.

Main Results:

• Phantom experiments confirmed the principle feasibility of the EPT approach.
• Initial conductivity measurements in the human brain successfully distinguished between cerebro-spinal fluid, grey matter, and white matter.

Conclusions:

• EPT is a feasible, non-invasive technique for measuring electrical conductivity in biological tissues using standard MR scanners.
• This technique holds promise for improved diagnostic capabilities and SAR prediction in MR imaging.