Determining transformation between different coordinate systems

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;
• and
• determining 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;
• and
• iii) combining the first intermediate transformation and the second intermediate transformation to obtain the transformation.