Fig. 5
The circle of Willis represented by edges, nodes and supply areas. The alphanumeric abbreviations and AcomA and PcomA stand for certain brain vessels (see legend) represented by edges. The round shapes represent nodes, whereas the quadratic shapes represent supply areas. M1: A1: anterior cerebral artery (ACA) segment 1, A2: ACA segment 2, M1: middle cerebral artery (MCA) segment 1, P1: posterior cerebral artery(PCA) segment 1, P2: PCA segment 2, PcomA and AcomA: posterior and anterior communicating arteries