Fig. 1
Computation of LV torsion from basal and apical images. The curved arrows represent the relative twist along the longitudinal axis of the left ventricle. LV twist (Ï•) was measured as the difference in rotation between the apex (Ï• a ) and base (Ï• b ) (twist direction shown as viewed from foot to head). Torsion (Ï„) was computed as LV twist divided by the distance (d) between basal and apical image locations