In-scan and scan-rescan assessment of LV in- and outflow volumes by 4D flow MRI versus 2D planimetry.

However, SV by 2D planimetry versus AV flow assessment by retrospective valve tracking showed a significant trend in scan 1 ( r = –0.64 P = 0.05), but not in scan 2 ( r = –0.17 P = 0.64), as shown in Fig. 2 a.

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To detect a possible trend in bias in the Bland–Altman plots, linear regression was performed for the differences versus the means.

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