Figure 4

Cardiac images from three subjects with different respiratory depths (left: Δd = 3.42 mm; middle: Δd = 6.23 mm; right: Δd = 12.60 mm). ES: end-systole, ED: end-diastole, SA: short-axis view, 2CH: two chamber view, 4CH: four chamber view. The dotted lines highlight the variation of respiratory depths in different subjects along three orthogonal directions, mainly in Superior to Inferior (S/I) direction.