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. 2023 Jul 3;14:114. doi: 10.1186/s13244-023-01458-x

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Fig. 6 — Measuring pulse wave velocity. The red circles on the aortic model (on the left) represent the planes at which flow is calculated using 4D flow data of the entire aorta. The distance between two consecutive planes (Δd) is subsequently divided by the time difference (Δt) between the start of respective pulse waves to yield mean pulse wave velocity (on the right)