This MR-based conductivity imaging (MRCI) toolbox is available to download. It includes Matlab functions for image reconstructions in magnetic resonance electrical impedance tomography (MREIT), diffusion tensor MREIT (DTMREIT), conductivity tensor imaging (CTI), and magnetic resonance current density imaging (MRCDI).
We developed a new MR-based current density imaging technique to monitor the current flow inside the brain during tDCS. We validated the current density imaging method using a realistic three-dimensional human head model, measured DT-MRI images, and simulated magnetic flux density data. We found that the method can reliably and quantitatively visualize internal current density distributions during tDCS treatments.