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Figure 4 Bland-Altman plot: difference between diameter by phase-contrast magnetic resonance angiography (PCMRA) and ultrasound (U/S) plotted against average diameter by PCMRA and U/S. Also shown are 95% limits of agreement (mean ± 2 SD). Diameter is greater by PCMRA. Solid square = baseline; open square = 1 min. after release of occlusion. MRI = magnetic resonance imaging.