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Figure 9 Calculation of PISA Derived ERO
The left image is a zoomed view of the flow convergence zone with color-flow imaging and down-shifting of the baseline resulting in an aliasing velocity of 22 cm/s. The radius (R) of the flow convergence is measured using the 2 crosses shown and the flow is calculated at 336 ml/s. The right image shows continuous-wave Doppler measurement of the peak regurgitant velocity (MR velocity). The ERO area is calculated at 67 mm2 or 0.67 cm2, as the ratio of flow to velocity. LV = left ventricle; other abbreviations as in Figure 8.
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