Some aspects of the proposed approachnamely, the propagation of the nodes' weights through the graph, which we metaphorically represent as the flow of a contrast medium across nodes (Section 3.3) -are somewhat similar in spirit to spreading activation (Collins and Loftus, 1975) and random walks on graphs (Lovász, 1993) approaches.
in contrast to spreading activation approaches we leverage the graph directionality in order to reach all the possible nodes within the same connected components.