Fig. 4

Transmural variation in helix angle (HA) and transverse angle (TA) in global myocardium as measured with DTI and STSRI. Regions were defined by the 17-segment American Heart Association model (bottom right). Means (solid lines) and standard deviations (dashed lines) are given over all voxels in each region. Angles were normalised to wall thickness in each region, with 0% and 100% corresponding to the LV subepicardium and subendocardium respectively