Fig. (2) Definition of the correct plane for measuring the diameter
of the pulmonary trunk (tp). Note the orientation of the original
sections (os). The inlay shows the virtual section plane (vs), which
was defined to cut through the volume data perpendicularly to the
longitudinal axis of the pulmonary trunk. aa = ascending aorta; da =
ductus arteriosus; dao = descending aorta. Scalebars = 200 µm.