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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
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Cardiovascular Ultrasound

ISSN: 1476-7120

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