Head tracking frame for dental navigation

A system for tracking a head of a patient, the system comprising:

• (a) a head tracker comprising:
• i. a frame comprising a front arm and two side arms, the two side arms being spaced apart to accommodate the width of the patient's head between the side arms;
• ii. at least one trackable target coupled to the frame, a position and orientation of the at least one trackable target being determinable by a motion tracking system tracking the target;
• iii. at least one nose pad coupled to the front arm of the frame, defining at least one nose pad contact surface for engaging with a nasion region of the patient;
• and
• iv. a pair of adjustable ear coupling members shaped for engaging with at least a portion of a back surface of an ear of the patient, each ear coupling member being coupled to a respective side arm;
• wherein
• the head tracker is configured to apply a clamping force to pull the at least one nose pad rearwardly to hold the nose pad contact surface against the nasion region of the patient and to pull the pair of adjustable ear coupling members forwardly to hold the ear coupling members against the back surfaces of the ears of the patient, to hold the at least one trackable target in a stable spatial relationship with a location of interest in the head of the patient;
• and
• (b) the motion tracking system, wherein the motion tracking system comprises a sensor for tracking the at least one trackable target and a processor configured for determining a position of the location of interest in the head of the patient from the position and orientation of the at least one trackable target of the head tracker and the stable spatial relationship.