Fig. 3.
Example 3D voxel-wise displacement and strain displays of the LV at end-diastole (a,d,g), mid-systole (b,e,h) and end-systole (c,f,i) are shown. The location of each dot represents the 3D position of an element of myocardium, and the color of each dot represents the strain value. Radial strain (Err) is shown in the top row (a–c), circumferential strain (Ecc) is shown in the middle row (d–f), and longitudinal strain (Ell) is shown in the bottom row (g–i). The Err values are mostly positive, which represents local tissue stretching in the radial direction. The Ecc and Ell values are mostly negative, representing local tissue shortening in the circumferential and longitudinal directions, respectively. Multiphase data are displayed as corresponding 3D displacement rendering movies in online supplemental data.