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Fig. 3 —Scatterplot illustrates relation between conspicuity (0, vein not visible, to 10, excellent visualization) and contrast-to-noise ratio in 134 cardiac vein segments. Significant positive correlation is seen between conspicuity and measured contrast-to-noise ratio (p < 0.0001; nonparametric two-tailed Spearman's r = 0.48 [95% confidence interval = 0.34-0.61]).