Conversion of EIT brain images for co-registration

Electrical Impedance Tomography (EIT) has previously been used to image brain function in evoked responses. The EIT images are based on a realistic 3D FEM model of the head. It would be advantageous to co-register the EIT images onto anatomical images generated through another modality, therefore allowing for an overlay of the measured functional brain activity with a true representation of the head. For realistic models, the problem is computationally intensive due to discrepancies between the tetrahedral mesh of the EIT images and the cubic meshes of other image modalities. This paper introduces Confeitir; a Matlab-based program, pioneering a novel approach to map the tetrahedral based EIT data onto a new structured cubic mesh, providing the capability of co-registration with other image modalities.