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Figure 2 Linear correlation between pulse transmission coefficient (PTC) and fractional flow reserve (FFR). The correlation was highly significant with a high correlation coefficient. Separated by the cutoff values (dotted lines) of 0.75 and 0.60 for FFR and PTC, respectively, the scattered distribution of most data points is observed either in the right upper quadrant or in the left lower quadrant. This represents a good agreement between the two parameters both above and below the cutoff values.
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