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ROI settings for evaluating CNR of a catheter.
Two ROIs were set on the CVC and B.G. for measuring the mean average signal intensities for CVC (SICVC) and background (SIB.G.), and standard deviation for background (SDB.G.) on the images, respectively.
CNR, contrast-noise ratio; CVC, central venous catheter; PMMA, polymethyl methacrylate; ROI, region of interest; B.G., background.
