Image Stitching for Achilles Tendon Ultrasonography Using Particle Swarm Optimization of Boundary Vector Field Based Similarity and Log-Domain Diffeomorphic Registration

Results: Simulation experiments of non-rigid registration on 20 image pairs show that the horizontal, vertical and distance registration errors of our method are 1.422, 0.628, and 1.616 pixel, respectively. Non-rigid registration experiments on 11 pairs of real clinical US images demonstrate that the horizontal, vertical and distance registration errors are 1.514, 1.205, and 1.928 pixel, respectively. Registration results on both synthetic images and real clinical images by our method exceeded those of other four methods. After image blending on multiple AT sections of US scans, panoramas of AT are generated for dual modality visualization of both B-mode and sonoelastography.