Patent ID: 11961187
Assignee: OXFORD UNIVERSITY INNOVATION LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 6:
7. The method as claimed in claim 6, wherein the effects of rigid motion are removed by:
(i) selecting a plurality of vessel landmarks from all projection planes;
(ii) estimating the 3D landmark locations as the point of intersection of 3D projection lines connecting the vessel landmarks on projection planes with the X-ray source;
(iii) estimating the optimal rigid transformation (translation and/or rotation) from each plane such that the back-projected 3D landmarks on the transformed projection planes match with the corresponding landmarks on 2D image planes;
(iv) repeating Steps (ii) and (iii) until convergence or the maximum number of iterations have been reached; and
(v) returning the optimal rigid transformation that minimises the effect of rigid motion.