Fig. 2

Post-processing of reconstructed edges within the proposed workflow of a subject in 2-chamber view, displayed in heat maps \(F(\theta ,t)\) and polar grids with their corresponding active contours \(f(\theta ,r)\). The heat maps (firs row) display the distance from the valve central point to the detected active contour, for every angle and every time frame, while the polar grids (second row) display the edge location in a time frame, similar to Fig. 1d. The mitral valve annotations are also displayed in red and green. a The detected active contours obtained with the proposed optimization problem before filtering. b With post-processing, the heat map is smoother and the false peaks were removed, marked in purple