Image registration

摘要

Disclosed is a method for defining a common reference system in a record of volume data that represents an area of a patient's jaw and is captured by means of an X-ray imaging process and a record of surface data, at least some of which represents the same area of the patient's jaw and which is captured by means of a process for measuring visible surfaces. Volume data and surface data are unhidden on a screen. An object, especially a tooth, which is recognizable in both the volume data and the surface data, is superimposed on each other as congruently as possible in a preliminary positioning step. A volume structure characterizing the object is extracted from the volume data, particularly as a type of edge image, and is made to overlap as much as possible with a corresponding surface structure of the surface data by means of a transformation function, the overlap of the volume structure being adjusted to the surface structure in iterative steps by optimizing a predefined quality level.

主权项

1. Process for defining a common reference system in a set of volume data that represents an area of a patient's jaw and that is recorded with an x-ray imaging process, and a set of surface data, at least some of which represents the same area of the patient's jaw and which is recorded with a process for measuring visible surfaces, comprising:
integrating the volume data and surface data on a screen, in a prepositioning, superimposing an object detected both in the volume data and in the surface data, as precisely as possible, extracting a volume structure that characterizes the object, in particular in the form of an edge image, from the volume data, and said edge image is superimposed as much as possible by means of a transformation function with a corresponding surface structure of the surface data, and matching the overlap of the volume structure under optimization of a specified quality criterion in iterative steps to the surface structure.