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Table 1 Variations observed in the plaque GSM and area

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

Plaque sample GSM (un-normalized) GSM (normalized) Area Periodical variations observed?
  mean s.d. CV (s.d./mean) mean s.d. CV (s.d./mean) mean (mm2) s.d. (mm2) CV (s.d./mean)  
px1 40.3 1.69 4.2% 40.5 1.69 4.2% 22.3 0.25 1.1% GSM
px2 32.3 2.80 8.7% 27.5 2.38 8.7% 27.9 1.12 4.0%  
px3 25.6 1.52 5.9% 24.4 1.45 5.9% 16.9 0.69 4.1% Both
px4 76.9 2.22 2.9% 71.0 2.08 2.9% 11.3 1.05 9.3%  
px5 36.9 4.31 11.7% 30.9 3.60 11.7% 22.0 0.96 4.4% Both
px6 33.8 2.87 8.5% 36.1 3.06 8.5% 28.9 3.56 12.3% Both
px7 33.6 0.84 2.5% 35.8 0.90 2.5% 52.5 1.14 2.2% Both
px8 28.3 2.02 7.1% 32.9 2.53 7.7% 7.2 0.44 6.0% Both
px9 29.6 1.19 4.0% 27.8 1.12 4.0% 21.9 0.59 2.7%  
px10 27.6 0.74 2.7% 26.3 0.70 2.7% 13.1 0.80 6.1%  
px11 70.2 1.27 1.8% 71.7 1.30 1.8% 38.0 0.23 0.61% Area
px12 54.0 3.72 6.9% 61.0 4.28 7.0% 14.9 0.39 2.6%  
px13 39.3 3.12 7.9% 33.5 3.05 9.1% 14.6 1.65 11.3% GSM
px14 40.9 1.66 4.1% 38.1 1.55 4.1% 30.2 1.29 4.3%  
px15 53.7 1.97 3.7% 53.1 1.95 3.7% 15.9 0.71 4.4%  
px16 31.9 1.68 5.3% 34.8 1.83 5.3% 14.6 0.93 6.4% Area
px18 73.3 5.30 7.2% 58.3 4.21 7.2% 25.8 0.82 3.2%  
px19 112.3 1.98 1.8% 95.7 1.72 1.8% 67.0 1.14 1.7%  
px21 52.4 2.35 4.5% 51.1 2.34 4.6% 22.7 1.09 4.8% GSM
px22 67.4 2.15 3.2% 56.7 1.80 3.2% 21.5 0.80 3.7% Both
px23 30.1 0.64 2.1% 25.6 0.54 2.1% 49.4 1.22 2.5% Excluded
px24 35.5 2.52 7.1% 36.9 2.62 7.1% 14.4 0.37 2.6% Excluded
px25 82.9 6.02 7.3% 82.3 5.98 7.3% 37.2 0.61 1.6% Excluded
px26 43.4 1.49 3.4% 55.3 1.90 3.4% 39.5 0.94 2.4%  
px27 50.1 1.17 2.3% 56.3 1.31 2.3% 66.1 1.68 2.5%  
px28 31.2 1.90 6.1% 42.4 2.58 6.1% 13.6 0.45 3.3% Area
px29 33.9 2.20 6.5% 27.2 1.77 6.5% 91.9 1.93 2.1%  
  1. The last column indicates whether periodical variations of the order of 60/min were seen on the inter-frame GSM and area waveforms. Normalized GSM refers to NORM1.