Fig. 3.

Scatter plots of the correlation between flow volumes [L/min] measured with (a) the 2D flow sequence, (b) the 4D flow GRAPPA2 sequence, and (c) the k-t-GRAPPA5 sequence versus the pump reference. The correlation coefficient R was 0.99 for each of the graphs. Bland-Altman analysis of flow volumes [L/min] measured with (d) the 2D flow sequence, (e) the 4D flow GRAPPA2 sequence, and (f) the k-t-GRAPPA5 sequence versus the pump reference the limits of agreement (LOA) between the flow volumes [L/min] in (d) 2D PCMRI, (e) GRAPPA2, and (f) k-t-GRAPPA5 and the pump reference. The limits of agreement were from 0.0 to 0.1, from − 0.1 to 0.08, and from − 0.08 to 0.1 L/min, respectively. 2D, two-dimensional; 4D, four-dimensional; GRAPPA, generalised autocalibrating partially parallel acquisition; L/min, litres per minute