Fig. 1
From: A review of current trends in three-dimensional analysis of left ventricular myocardial strain
3D strain analysis. The upper panel illustrates the concept of block matching. The software searches for a cube in 3D space that is most similar to the cube in the previous frame (white cube). The same process is performed throughout one cardiac cycle, from which the software computes distance, time, and direction. Lower panels show calculation of area and principal strain. Ced(es) signifies circumferential distance at end-diastole (end-systole). Led(es) denotes longitudinal distance at end-diastole (end-systole). Aed(es) represents area at end-diastole (end-systole). Area strain is defined as Aed – Aes / Aed (%). Principal strain is defined as Ped -Pes / Ped (%).ED, end-diastole; ES, end-systole