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When the sensor left the vascular boundary, the statistic data were the relation between the positions and the template correlation coefficients with the mean (solid circle) and standard deviation (bar). The left and right boundaries were set as the base position, 0 mm, which template correlation coefficients are 0.987 ± 0.016 and 0.978 ± 0.028, respectively. (a) The left side of radial artery, (b) The right side of radial artery.
