Figure 4From: Evaluation of left ventricular torsion by cardiovascular magnetic resonanceCalculation of torsional shear angle from two short axis slices, one basal and one apical. r apex , r base : average radius of the cross-section at apical and basal slices respectively. ϕ apex , ϕ base : average rotation of the cross section at apical and basal slices respectively. D: distance between slices. θ CL : torsional shear angle. Modified from [89].Back to article page