Skip to main content

Table 3 Intra-observer coefficients of variation (standard errors) for the measurement of the inter-frame mean GSM (un-normalized and NORM1 normalized) and mean area, for eight plaque samples

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

Plaque sample GSM Area NORM1
px2 1.7% (0.24) 2.9% (0.37) 2.3% (0.29)
px4 0.5% (0.18) 2.3% (0.11) 4.4% (1.39)
px11 1.6% (0.48) 1.4% (0.24) 4.7% (1.53)
px26 1.1% (0.22) 1.5% (0.26) 1.2% (0.30)
px21 1.4% (0.32) 2.5% (0.25) 2.4% (0.56)
px22 1.5% (0.45) 2.9% (0.29) 1.7% (0.43)
px12 1.8% (0.44) 3.3% (0.22) 2.4% (0.66)
px5 1.4% (0.23) 2.3% (0.23) 3.3% (0.46)
Column means 1.4% (0.32) 2.4% (0.24) 2.8% (0.70)