Fig. 4
From: A flexible framework for sequential estimation of model parameters in computational hemodynamics
Signed wall distance metric for wall motion observations. a The distance metric is the Euclidean distance between a point and the surface, and is positive in the outward-pointing unit normal direction, and negative otherwise. A distance map between points on the deformed wall boundary and the j-th data surface \(S_{j}\) is shown. b The signed metric is used to compute an interpolated distance between consecutive times where wall position data \(S_{j}\) are available. Note that the blue curve represents the current wall boundary; the “interpolated” surface \(S_{t}\) between \(S_{j}\) and \(S_{j+1}\) is never constructed, and is not shown