Headshape Digitization using an Ultrasound 3D Acquisition System

Localization of neuromagnetic sources requires co-registration in order to map data registered by magnetoencephalography (MEG) onto the corresponding anatomic structure. Co-registration on the other hand often involves head shape digitization, which is usually carried out using a 3D digitization system that has a reference point which is not fixed at the subjects head. Therefore, the major drawback of such systems is that head motion artefacts during the digitization process cannot be compensated. We instead use the Zebris 3D Motion Analyzer for headshape digitization outside the magnetically shielded room provi…