A system includes a head supporting device, an alignment checker and a scanning device. The head supporting device is disposed on a first surface of an examination table for supporting a patient. The head supporting device includes an adjustable headrest platform for supporting a head of the patient. The adjustable headrest platform is configured to be movable along a direction perpendicular to the first surface of the examination table. The alignment checker is disposed on the examination table. The alignment checker is located corresponding to the head of the patient. The alignment checker is configured to verify a location or an orientation of the head of the patient. The scanning device is configured for capturing a scan image corresponding to a mandible of the patient.
