Impact of semi-automated versus manual image segmentation errors on myocardial strain calculation by MR tagging. Contour estimation in tagged cardiac magnetic resonance images. LV is represented by a finite element model that is deformed to fit the displacements of the magnetic tags. A typical element topology has 16 elements for each surface.
Motion is determined solely by the tag grid intersections.
In the final deformation fit, the average distance between the true and predicted deformed data was approximately 0.3 mm over all the cases.