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Table 3 Magnitude of variance components for QUS measurements computed for the images recorded in longitudinal 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 longitudinal view (%)
  S E V I SE SV SI EV EI VI SEV SEI SVI EVI SEVI
Geometric
 Thickness
  Sympt 83.0 2.2 0.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 6.2 4.0 1.7 0.0 1.9
  Asympt 86.2 0.8 0.0 0.0 2.8 0.0 0.0 0.0 0.0 0.0 3.3 1.4 0.8 0.0 4.8
Grayscale histogram
 Echogenicity
  Sympt 75.7 0.0 0.0 0.0 7.7 0.0 0.0 0.0 0.0 0.1 8.8 1.2 0.5 0.0 5.8
  Asympt 85.2 0.0 0.0 0.0 3.4 1.6 0.0 0.1 0.0 0.0 3.4 0.0 0.0 0.0 6.2
 Variance
  Sympt 35.1 1.1 0.0 0.0 32.9 0.0 0.0 0.0 0.0 0.0 12.2 0.0 0.0 0.0 18.7
  Asympt 61.7 0.0 0.1 0.0 1.0 0.0 0.0 0.0 0.0 0.0 8.7 0.0 1.3 0.0 27.3
 Skewness
  Sympt 21.8 13.2 0.0 1.9 15.0 0.0 0.0 0.2 0.3 1.8 0.0 0.0 7.4 0.0 38.5
  Asympt 26.8 7.6 0.0 0.0 12.7 0.0 0.0 0.0 0.4 0.1 7.3 11.0 3.9 0.0 30.2
 Kurtosis
  Sympt 10.9 5.8 0.0 0.0 17.4 0.0 0.0 0.0 0.2 2.0 11.0 0.0 8.8 0.0 43.9
  Asympt 16.3 7.3 0.0 0.0 19.1 0.5 0.3 0.0 1.1 0.0 9.3 13.4 1.9 0.0 30.8
 Entropy
  Sympt 44.0 0.0 0.0 0.0 26.3 0.0 0.0 0.0 0.0 0.0 16.4 1.6 2.1 0.0 9.6
  Asympt 58.8 0.2 0.2 0.0 5.7 0.0 0.0 0.0 0.0 0.0 10.2 0.0 5.5 0.0 19.5
Co-occurrence matrix
 Contrast
  Sympt 55.3 0.0 0.0 0.0 8.1 0.0 0.0 0.4 0.5 0.0 12.8 7.0 6.1 0.0 10.0
  Asympt 61.3 0.0 0.0 0.0 4.5 0.8 0.0 0.9 0.0 0.2 5.1 0.0 4.2 0.0 22.9
 Energy
  Sympt 40.9 0.0 0.0 0.4 19.6 0.0 0.4 0.0 0.0 0.0 17.8 0.9 0.0 0.0 20.0
  Asympt 55.3 0.0 0.0 0.0 9.2 0.4 0.0 0.7 0.0 0.0 8.1 0.0 4.4 0.0 22.0
 Homogeneity
  Sympt 56.3 0.0 0.0 0.0 6.3 0.0 0.0 0.0 0.0 0.0 12.5 4.7 7.8 0.0 12.5
  Asympt 63.9 0.0 0.0 0.0 6.9 1.4 0.0 1.4 0.0 0.0 4.2 0.0 4.2 0.0 18.1