Determining transformation between different coordinate systems

摘要

A system (100) is provided for determining a transformation between different coordinate systems associated with different medical data. In determining the transformation, the system (100) makes use of a third set of anatomical landmarks (040) defined in a reference coordinate system to match a first set of anatomical landmarks (010) defined in a first coordinate system to a second set of anatomical landmarks (020) defined in a second coordinate system. Effectively, the third set of anatomical landmarks is used as an intermediary in obtaining the transformation between both input sets of coordinate systems. As the third set of anatomical landmarks includes the anatomical landmarks of both input sets, it is not needed for both input sets to be identical or even to overlap. Rather, even in case both input sets are entirely disjunct, i.e., not-overlapping, it is still possible to determine the transformation between the different coordinate systems.

主权项

1. A system for determining a transformation between different coordinate systems associated with different medical data, comprising:
a landmark input for obtaining first coordinates representing a first set of anatomical landmarks in a first coordinate system and second coordinates representing a second set of anatomical landmarks in a second coordinate system; a matching subsystem configured for:
providing reference coordinates representing a third set of anatomical landmarks in a reference coordinate system, the third set of anatomical landmarks comprising the first set of anatomical landmarks and the second set of anatomical landmarks; anddetermining a transformation between the first coordinate system and the second coordinate system by:
i) determining a first intermediate transformation between the first coordinate system and the reference coordinate system by matching the first set of anatomical landmarks to the third set of anatomical landmarks;ii) determining a second intermediate transformation between the second coordinate system and the reference coordinate system by matching the second set of anatomical landmarks to the third set of anatomical landmarks; andiii) combining the first intermediate transformation and the second intermediate transformation to obtain the transformation.