Abstract: Objective: To confirm the location of the electrode contacts which were implanted into the cranium. Methods: Ten patients who suffering intractable epilepsy underwent intracranial electrodes implantation. Before and after the electrodes implantation head MRI and CT scan were done respectively, then the 3D image data of MRI and CT were co-registered. Results: We got the 3D infused images form which we can easily observe the relationship between cerebrum and the electrode contacts. we can easily see the location of each contact directly and then to conduct the following mapping through the infused images. Conclusion: 3D digital images co-registration technique is useful to confirm the accurate location of the implanted electrode contacts.

Key words: 3D-image co-registration, Electrodes implantation, Location of electrode contacts, Preoperation evaluation