torsion was calculated as the difference between the angles of rotation ( radians ) of echo-derived transverse cross-section projections of the lv obtained at the mitral valve and low papillary level , divided by the axial distance between these projections measured in a long-axis cross-section , and multiplied by the outer radius in a mid-papillary transverse projection of the lv .
C0026264
mitral valve
C0225897
lv