Figure 4
US feature extraction workflow. (a) Original US image of a fat layer on top of muscle measurement; (b) vertical gradient image; (c) result of applying the graph theory algorithm. The blue line represents the contact surface as selected by the graph theory, which is excluded from further analysis. The red lines represent the three best paths that were selected. The numbers indicate the selection order, with path 1 being the first path selected with the lowest cost. The green line represents the DRS measurement location in the center of the US image, with the feature extraction points.
