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Figure 8 Time sequence of circumferential shortening in a healthy subject by tagged magnetic resonance imaging. Several segments contract beyond aortic valve closure. + = measured data points; – = fitted line model to data for estimating T _onset; circled + = end point of data used in the fit; upside-down triangles = estimated T _onset; triangles = T _peak. The vertical lines denote, from left to right, the moment of aortic valve opening (dashed), aortic valve closure (solid), and mitral valve opening (dashed). AL = anterolateral; AN = anterior; AS = antero-septal; IL = inferolateral; IN = inferior; IS = inferoseptal. Reproduced from Zwanenburg et al. (77) with permission.