23 February 2010 Measurement of complex joint trajectories using slice-to-volume 2D/3D registration and cine MR
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A method for studying the in vivo kinematics of complex joints is presented. It is based on automatic fusion of single slice cine MR images capturing the dynamics and a static MR volume. With the joint at rest the 3D scan is taken. In the data the anatomical compartments are identified and segmented resulting in a 3D volume of each individual part. In each of the cine MR images the joint parts are segmented and their pose and position are derived using a 2D/3D slice-to-volume registration to the volumes. The method is tested on the carpal joint because of its complexity and the small but complex motion of its compartments. For a first study a human cadaver hand was scanned and the method was evaluated with artificially generated slice images. Starting from random initial positions of about 5 mm translational and 12° rotational deviation, 70 to 90 % of the registrations converged successfully to a deviation better than 0.5 mm and 5°. First evaluations using real data from a cine MR were promising. The feasibility of the method was demonstrated. However we experienced difficulties with the segmentation of the cine MR images. We therefore plan to examine different parameters for the image acquisition in future studies.
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C. Bloch, C. Bloch, M. Figl, M. Figl, C. Gendrin, C. Gendrin, C. Weber, C. Weber, E. Unger, E. Unger, S. Aldrian, S. Aldrian, W. Birkfellner, W. Birkfellner, } "Measurement of complex joint trajectories using slice-to-volume 2D/3D registration and cine MR", Proc. SPIE 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling, 76253C (23 February 2010); doi: 10.1117/12.844109; https://doi.org/10.1117/12.844109

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