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Table 4 Magnitude of variance components for QUS measurements computed for the images recorded in transverse view

From: Quantitative ultrasound imaging of Achilles tendon integrity in symptomatic and asymptomatic individuals: reliability and minimal detectable change

QUS measurements Relative variance proportions for images recorded in transverse view (%)
  S E V I SE SV SI EV EI VI SEV SEI SVI EVI SEVI
Geometric
 Area (CSA)
  Sympt 92.8 0.0 0.0 0.0 3.0 0.1 0.2 0.0 0.0 0.1 0.9 0.0 0.4 0.0 2.4
  Asympt 86.8 0.0 0.0 0.0 3.9 0.0 0.1 0.0 0.0 0.0 1.6 1.3 0.0 0.1 6.3
 Thickness
  Sympt 92.6 0.0 0.0 0.0 3.3 0.2 0.1 0.0 0.0 0.0 1.9 0.4 0.0 0.1 1.5
  Asympt 74.5 0.0 0.0 0.0 8.7 0.2 0.0 0.0 0.0 0.0 2.1 3.9 0.0 0.0 10.5
 Width
  Sympt 80.4 0.0 0.0 0.0 2.0 0.0 0.2 0.0 0.0 0.4 2.1 0.0 0.0 0.0 15.0
  Asympt 71.0 2.3 0.1 0.0 7.3 0.0 0.0 0.0 0.1 0.0 6.8 1.6 1.6 0.1 9.2
Grayscale histogram
 Echogenicity
  Sympt 81.3 4.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 6.1 1.5 1.5 0.4 4.6
  Asympt 73.2 5.0 0.0 0.0 4.0 0.0 0.0 0.0 0.0 0.0 2.3 0.0 1.6 0.0 13.9
 Variance
  Sympt 31.2 13.7 0.0 0.0 9.4 0.0 0.0 0.0 0.1 0.8 26.3 5.1 4.5 0.2 8.6
  Asympt 49.9 10.1 0.0 0.0 6.7 1.4 0.0 0.0 0.0 0.0 10.7 2.8 2.0 0.0 16.5
 Skewness
  Sympt 42.9 7.5 0.0 0.0 1.0 7.2 0.0 0.0 0.0 0.0 2.2 0.0 0.0 0.0 39.2
  Asympt 58.9 0.0 0.0 0.0 0.8 1.0 0.1 0.0 0.2 0.0 9.0 7.0 0.0 0.3 22.7
 Kurtosis
  Sympt 37.8 0.3 0.5 0.0 0.0 6.7 0.0 0.0 0.3 0.0 13.5 6.9 0.0 0.0 34.1
  Asympt 44.6 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 11.8 16.3 4.7 0.8 21.1
 Entropy
  Sympt 25.8 4.3 0.0 0.0 0.0 0.0 0.0 0.0 0.7 2.1 40.0 5.9 10.8 0.0 10.5
  Asympt 48.8 3.6 0.0 0.0 12.3 4.2 3.6 0.0 0.2 0.2 5.7 1.8 0.0 0.0 19.5
Co-occurrence matrix
 Contrast
  Sympt 73.8 6.8 0.0 0.0 1.3 0.0 1.4 0.0 0.0 0.0 8.3 0.1 0.0 0.4 7.8
  Asympt 59.6 2.2 0.0 0.6 4.0 3.0 0.0 0.0 0.0 0.6 5.2 3.3 2.5 0.0 19.0
 Energy
  Sympt 58.2 5.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 21.8 3.0 2.4 0.6 7.3
  Asympt 68.9 4.9 0.0 0.0 4.9 2.5 0.8 0.0 0.0 0.0 3.3 0.0 0.0 0.0 14.8
 Homogeneity
  Sympt 80.8 6.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 0.0 0.0 1.0 8.1
  Asympt 67.2 4.9 0.0 0.0 4.9 0.0 0.0 0.0 0.0 0.0 1.6 1.6 1.6 0.0 18.0