Comparison between SV from respiratory-gated 4D (Resp(+)) and non-gated 4D (Resp(-)) vs conventional 2D flow. Both SV deduced from aortic and main pulmonary arterial flow are included. The left column shows scatter plots of SV from 4D flow (ml) and 2D flow (ml). Solid lines show the line of identity. The right column shows the corresponding Bland Altman plots (bias±1.96SD). Panel A shows comparison between Resp(+) 4D and 2D. Panel B show the results for SV from 4D Resp(-). The bias and spread were similar for both methods.