Figure 4.

Aortic root geometry at end-diastole. Data from Dagum et al. and expressed as group mean±s.d. per cent change of deformation (longitudinal, circumferential, shear and torsion) during end-diastole unless specified otherwise. The commissural circumference, computed as the sum of the three inter-marker lengths, and diameter, derived assuming a circular cross section, were 58.9±6.7 and 22.6±2.6 mm, respectively. The base circumference and diameter, similarly computed and derived, were 64.4±6.5 and 24.7±2.5 mm, respectively. The base-to-commissure diameter ratio was 1 : 0.92 (Dagum et al. 1999). Lansac et al. (2002) observed the following diameter ratio between the commissures, STJ and the ascending aorta with respect to the base: 0.68, 0.69 and 0.66, respectively.