| 主权项 |
1. An apparatus for registering a human jaw with a scanned volumetric image of the human jaw, the apparatus comprising:
an appliance repeatably attachable to the human jaw, the appliance comprising a rigid fiducial body and constructed such that when the appliance is attached to the human jaw the rigid fiducial body is in a fixed spatial relationship with the human jaw; wherein: a surface of the rigid fiducial body comprises a side surface and an opposite side surface, the opposite side surface spaced apart from the side surface throughout the rigid fiducial body, at least one of the side surface and the opposite side surface defining a fiducial plane; the surface of the rigid fiducial body further comprises a plurality of feature regions, each feature region defining a feature point location and a plurality of geometrical characteristics associated with that feature point location; the rigid fiducial body has a curved profile such that a projection of the curved profile onto the fiducial plane is generally curved, the curved profile being shaped to follow a curve of the human jaw when the appliance is attached to the human jaw; the rigid fiducial body is formed such that when the human jaw is tomographically scanned with the appliance attached thereto, a representation of at least a portion of the surface of the rigid fiducial body is identifiable as a boundary in the scanned volumetric image; when the portion of the surface identifiable as the boundary in the scanned volumetric image comprises two of the feature regions, a unique coordinate mapping between the rigid fiducial body and the scanned volumetric image is determinable from the fiducial plane and the plurality of geometrical characteristics for each of the two feature regions; and, the plurality of geometrical characteristics for each of the two feature regions and the fiducial plane are determinable from the boundary in the scanned volumetric image. |
