Patent ID: 9642560
Date: 2017-05-09
CPC Classifications: A61B,G01B,G06K,G06T

Claim:
1. A data processing method for determining the relative Orientation of an object co-ordinate system of an anatomical object in a global co-ordinate system, comprising: acquiring a reference direction dataset representing a first reference direction of a line between a first anatomical landmark of a reference object and a second anatomical landmark of the reference object, and a second reference direction of a line between a third anatomical landmark of the reference object and a fourth anatomical landmark of the reference object, wherein the first and second reference directions are given in a reference co-ordinate system and the reference object corresponds to the anatomical object; acquiring an object direction dataset representing a first object direction of a line between the first anatomical landmark of the anatomical object and the second anatomical landmark of the anatomical object, and a second object direction of a line between the third anatomical landmark of the anatomical object and the fourth anatomical landmark of the anatomical object, wherein the first and second object directions are given in the global co-ordinate system and the landmarks of the anatomical object correspond to the landmarks of the reference object; calculating the orientation of the reference co-ordinate system relative to the global co-ordinate system which results in the best match between each of the reference directions and the respectively corresponding object direction; and using the orientation of the reference co-ordinate system in the global co-ordinate system as the relative orientation of the object co-ordinate systems, wherein the object directions are determined from landmark directions, wherein a landmark direction is the direction of a line between a landmark and a common reference point which is none of the landmarks and which is static in the global co-ordinate system.