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Table 4 Intra- and interobserver reproducibility of the entire process (acquisition including analysis) and of solely the analysis of ultrasound measurements

From: Assessing radiation-induced carotid vasculopathy using ultrasound after unilateral irradiation: a cross-sectional study

Parameter Location Time point Process (n = 26) Analysis (n = 10)
Intra-observer ICC (95% CI) Intra-observer ICC (95% CI) Inter-observer ICC (95% CI)
IMT (mm) Distal CCA Diastole 0.972 (0.956–0.983) 0.930 (0.833–0.972) 0.939 (0.853–0.976)
ICA 0.657 (0.510–0.778) 0.570 (0.167–0.726) 0.272 (− 0.100–0.607)
PWV (m/s) Mid-CCA Begin-systole 0.725 (0.554–0.852) n/a1 n/a1
End-systole 0.707 (0.551–0.828) n/a1  n/a1 
SWV (m/s) Proximal CCA Averaged A: 0.873 (0.804–0.922) A: 0.998 (0.994–0.999) A: 0.991 (0.977–0.997)
P: 0.745 (0.628–0.837) P: 0.995 (0.979–0.998) P: 0.978 (0.867–0.994)
Mid-CCA A: 0.919 (0.874–0.950) A: 0.997 (0.992–0.999) A: 0.995 (0.986–0.998)
P: 0.876 (0.811–0.923) P: 0.997 (0.984–0.999) P: 0.986 (0.885–0.996)
Distal CCA A: 0.899 (0.846–0.937) A: 0.997 (0.992–0.999) A: 0.996 (0.989–0.998)
P: 0.881 (0.820–0.926) P: 0.998 (0.984–0.999) P: 0.992 (0.976–0.997)
ICA A: 0.916 (0.866–0.950) A: 0.994 (0.986–0.998) A: 0.988 (0.970–0.995)
P: 0.859 (0.773–0.919) P: 0.974 (0.928–0.990) P: 0.963 (0.898–0.986)
  1. IMT intima-media thickness, PWV pulse wave velocity, SWV shear wave velocity, CCA common carotid artery, ICA internal carotid artery, ICC intraclass correlation coefficient, CI confidence interval, A anterior, P posterior
  2. 1Automatic analysis by Aixplorer system so independent of user interpretation