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Table 4 Comparison with manual delineation for eight selected plaque samples

From: Dynamic variations in the ultrasound greyscale median of carotid artery plaques

Plaque sample Our method Manual delineation
GSM Area GSM Area
  mean s.d. CV mean (mm2) s.d. (mm2) CV mean s.d. CV mean (mm2) s.d. (mm2) CV
px2 32.3 2.80 8.7% 27.9 1.12 4.0% 28.7 3.88 13.5% 27.5 2.10 7.6%
px4 76.9 2.22 2.9% 11.3 1.05 9.3% 78.1 4.57 5.9% 11.0 2.03 18.4%
px11 70.2 1.27 1.8% 38.0 0.23 0.61% 73.0 3.36 4.6% 37.4 0.40 1.1%
px26 43.4 1.49 3.4% 39.5 0.94 2.4% 45.9 2.27 4.9% 36.9 1.61 4.4%
px21 52.4 2.35 4.5% 22.7 1.09 4.8% 51.3 2.86 5.6% 22.1 1.80 8.1%
px22 67.4 2.15 3.2% 21.5 0.80 3.7% 67.6 3.54 5.2% 21.3 1.75 8.2%
px12 54.0 3.72 6.9% 14.9 0.39 2.6% 52.9 4.47 8.5% 15.0 1.23 8.2%
px5 36.9 4.31 11.7% 22.0 0.96 4.4% 36.0 4.66 13.0% 22.4 1.71 7.7%
Column means 54.2 2.54 5.4% 24.7 0.82 4.0% 54.2 3.70 7.7% 24.2 1.58 8.0%
  1. GSM values are un-normalized and CV is the coefficient of variation (s.d./mean).