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 |