Fig. 3

Effect of exposure time on measured LV function. Panels A-D illustrate the effect of exposure time on measured slice volume in one patient. A Measured LV slice volumes for 4 exposure times (50-840 ms) in a clinical patient in sinus rhythm with a heart rate of 76 bpm. B Dependence of measured end-diastolic (blue) and end-systolic (red) slice volumes on exposure time. C The effect of exposure time on measured stroke volume in a slice. D The effect of exposure time on measured ejection fraction in a slice. The corresponding cine slice measurements are depicted with a horizontal black line in B, C and D. The real-time values depict the mean (solid line) and standard deviation (shaded area) of the volume measured across real-time beats. Panels E-H illustrate the error between manual segmentation of cine images and semi-automated processing of real-time images from single slices in 7 different patients. The change in the measured error (blue line) and standard deviation (blue shaded area) as a function of exposure time are shown for measured slice EDV (E), ESV (F), SV (G), and EF (H). An exposure time of 95.2 ms resulted in no statistical difference of the measured error (vertical black dotted line). The occurrence of a statistically significant difference is shown in each panel with red crosses