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Table 2 Effect of dynamic range, gain and probe distance on wall thickness measurements

From: Ultrasound settings significantly alter arterial lumen and wall thickness measurements

   Phantom A   Phantom B   Phantom C  
   Wall thickness (mm) p Wall thickness (mm) p Wall thickness (mm) p
Dynamic range (dB) 40 0.543 ± 0.042 0.002 1.058 ± 0.014 <0.001 1.483 ± 0.019 <0.001
  45 0.549 ± 0.041   1.061 ± 0.012   1.486 ± 0.019  
  50 0.554 ± 0.041   1.063 ± 0.012   1.489 ± 0.020  
  55 0.559 ± 0.041   1.064 ± 0.012   1.492 ± 0.020  
  60 0.560 ± 0.042   1.065 ± 0.013   1.493 ± 0.020  
Gain (dB) -10 0.548 ± 0.044 0.38 1.064 ± 0.014 0.03 1.496 ± 0.021 <0.001
  -5 0.554 ± 0.043   1.064 ± 0.012   1.490 ± 0.020  
  0 0.554 ± 0.041   1.063 ± 0.012   1.487 ± 0.019  
  +5 0.555 ± 0.040   1.060 ± 0.012   1.485 ± 0.018  
  +10 0.554 ± 0.041   1.061 ± 0.012   1.485 ± 0.018  
Probe distance (mm) 10 0.541 ± 0.040 <0.001 1.064 ± 0.010 0.98 1.490 ± 0.018 0.29
  15 0.545 ± 0.041   1.054 ± 0.010   1.489 ± 0.015  
  20 0.559 ± 0.038   1.074 ± 0.008   1.489 ± 0.021  
  25 0.569 ± 0.042   1.057 ± 0.012   1.486 ± 0.022  
  1. Data are mean ± standard deviation
  2. n = 80 per level for dynamic range (5 gain levels × 4 distance levels × 4 angles)
  3. n = 80 per level for gain (5 dynamic range levels × 4 distance levels × 4 angles)
  4. n = 100 per level for probe distance (5 gain levels × 5 dynamic range levels × 4 angles)
  5. P-values are for trend from a univariate linear regression model
  6. Phantom A has an estimated mean wall thickness of 0.54 ± 0.01 mm.
  7. Phantom B has an estimated mean wall thickness of 1.06 ± 0.01 mm.
  8. Phantom C has an estimated mean wall thickness of 1.56 ± 0.01 mm