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. 2023 Nov 19;40(2):341–350. doi: 10.1007/s10554-023-02992-x

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Fig. 1 — Pulse-wave Doppler in the left ventricle outflow tract (LVOT) of a patient with severe aortic stenosis. Transaortic flow rate (FR) is calculated dividing the Doppler-derived stroke volume by the ejection time (ET, in blue), using velocity time integral (VTI, in yellow) of the LVOT and respective LVOT diameter (LVOTd, not shown)