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Table 1 Effect of dynamic range, gain and probe distance on lumen diameter measurements

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

   Phantom A   Phantom B   Phantom C  
   Lumen (mm) p Lumen (mm) p Lumen (mm) p
Dynamic range (dB) 40 4.77 ± 0.09 <0.001 5.71 ± 0.09 <0.001 4.75 ± 0.10 <0.001
  45 4.75 ± 0.09   5.69 ± 0.09   4.73 ± 0.10  
  50 4.73 ± 0.08   5.68 ± 0.08   4.71 ± 0.09  
  55 4.71 ± 0.08   5.66 ± 0.07   4.68 ± 0.09  
  60 4.70 ± 0.07   5.64 ± 0.06   4.67 ± 0.08  
Gain (dB) -10 4.79 ± 0.07 <0.001 5.75 ± 0.06 <0.001 4.77 ± 0.07 <0.001
  -5 4.77 ± 0.07   5.71 ± 0.06   4.75 ± 0.08  
  0 4.74 ± 0.08   5.68 ± 0.06   4.71 ± 0.08  
  +5 4.70 ± 0.08   5.64 ± 0.06   4.67 ± 0.09  
  +10 4.67 ± 0.08   5.60 ± 0.06   4.64 ± 0.09  
Probe distance (mm) 10 4.80 ± 0.07 <0.001 5.74 ± 0.06 <0.001 4.75 ± 0.08 <0.001
  15 4.75 ± 0.08   5.71 ± 0.07   4.75 ± 0.07  
  20 4.70 ± 0.09   5.64 ± 0.07   4.67 ± 0.10  
  25 4.68 ± 0.08   5.62 ± 0.06   4.67 ± 0.10  
  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 and C have an estimated lumen diameter of 4.98 ± 0.01 mm
  7. Phantom B has an estimated lumen diameter of 5.98 ± 0.01 mm.