A method includes acquiring an anatomical image ofat least part of a head of a specific patient, theanatomical image capturing at least a selected locationin the head. A personalized gripper, which is shapedbased on the anatomical image to personally fit an organof the specific patient at the selected location, andwhich includes a first position sensor of aposition-tracking system, is fitted. The anatomical image isregistered with a coordinate system of theposition-tracking system, by identifying the selected location inthe anatomical image and measuring a first position ofthe first position sensor using the position-trackingsystem. A medical device that includes a second positionsensor of the position-tracking system, is navigated inthe head of the specific patient by displaying a secondposition of the medical device in the head on theregistered anatomical image.
