Table 4.
Inter-session pairwise repeatability of AC values obtained using different ultrasound attenuation examination platforms
| AC value (dB/cm/MHz) |
P-valuea) | Mean bias | BALA | ICC | CV (%) | Pearson r | ||
|---|---|---|---|---|---|---|---|---|
| 1st session | 2nd session | |||||||
| ATI | 0.75±0.12 | 0.74±0.12 | 0.085 | 0.00 | -0.03 to 0.03 | 0.962 (0.931 to 0.979) | 4.9 (0.9 to 7.0) | 0.931 (0.878 to 0.961) |
| TAI | 0.80±0.11 | 0.81±0.11 | 0.126 | -0.01 | -0.10 to 0.08 | 0.957 (0.922 to 0.976) | 3.9 (1.2 to 5.3) | 0.920 (0.858 to 0.955) |
| UGAP | 0.74±0.09 | 0.75±0.09 | 0.385 | 0.00 | -0.07 to 0.06 | 0.962 (0.931 to 0.979) | 3.4 (2.6 to 4.0) | 0.926 (0.869 to 0.959) |
Numbers in parentheses are 95% confidence intervals.
AC, attenuation coefficient; BALA, Bland-Altman limits of agreement; ICC, intraclass correlation coefficient; CV, coefficient of variation; ATI, Attenuation Imaging; TAI, Tissue Attenuation Imaging; UGAP, Ultrasound-Guided Attenuation Parameter.
a)
P-values were calculated using the paired Student t-test (two-tailed).