Movie 2:

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Flow quantification from 4D flow MRI in a 59-year-old man with severe MR and multiple regurgitation jets by observer 2. A-B) Original Rvol_FLOW measurement, which was 64 mL lower than observer 1’s measurement. Not all regurgitation jets are captured because the measurement plane extends outside the field-of-view. During MV regurgitation, aortic and pulmonary outflow are also visible in the velocity projection. C-D) Revised Rvol_FLOW measurement, which is still 32 mL lower than observer 1’s measurement due to differently angulated measurement planes between the observers.