Measurement of

Figure 2: Stroke volume calculation. A scan plane is prescribed perpendicular to the ascending aorta (a). A region of interest corresponding the aorta’s cross-sectional area (d) is obtained by applying a threshold to the magnitude (b) and phase-difference (c) images. A volume flow waveform is obtained from the time-velocity distribution within the ROI (e). The SV (indicated) is calculated as the integral of the flow within each R-R interval (red dots)