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Flowchart for calculation of geometric parameters: (a) Load DICOM CT image; (b) vessel segmentation program; (c) segmented image; (d) point clouds generated from outer wall points; (e)–(g) interpolation; (h)–(j) uniformly distribute points; (k) generate coarse topology; (l) polygon refinement; (m, n) polygon smoothing; (o) final topology generated; (p)–(r) quantification of geometric indices and wall thickness.
