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The correlation analysis showed a good overlap between measurements (Qp: r = 0.65, p = 0.0004; Qs: r = 0.64, p = 0.0005; Qp/Qs ratio: r = 0.68, p = 0.0002), also confirmed by regression analysis (R2 = 0.42, p < 0.001 for Qp; R2 = 0.41, p = 0.001 for QS; R2 = 0.46, p < 0.001 for Qp/Qs ratio), and by the Bland-Altman statistical analysis for method comparison (see Figure 1). The interobserver variability was low.

1054 Noninvasive Qp/Qs ratio measurement with phase-contrast cine MRI in patients with atrial septal defect: comparison with heart catheterization