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FIGURE 7. Correlation between reference region-derived and plasma-derived BP values. Reference region was extracted by supervised algorithm. BP values with reference region input were calculated using RS-ESA (A) and SRTM (B). In the case of RS-ESA, there was very close agreement and high correlation (r = 0.811, P < 10–5) between BP values calculated by reference tissue input and those derived from plasma input. SRTM consistently underestimated BP values and correlation with plasma-derived measures was poorer (r = 0.507, P = 0.004).
