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Table 1 Coefficients of variation (%) for splenic perfusion-related parameters of the different ROIs

From: Impact of region-of-interest size and location on quantitative contrast-enhanced ultrasound of canine splenic perfusion

  Proximal ROI (A) Middle ROI (B) Distal ROI (C) ROI Max
PEAK 19.46 18.43 21.58 17.89
TTP 24.36 25.59 30.51 22.12
RBV 36.49 38.67 41.68 36.94
RBF 23.92 23.66 24.16 20.76
MTT 29.23 24.48 25.35 21.68
  1. ROI region of interest; Peak peak enhancement; TTP time to peak; RBV Regional blood volume; RBF Regional blood flow; MTT mean transit time