Table 3. Reproducibility of quantitatively measuring plaque size on ultrasound and MR images.

Imaging measurements	Inter-observer agreement, ICC (95% CI)	Intra-observer agreement, ICC (95% CI)
Longitudinal ultrasound images
Max WT	0.961 (0.852–0.990)	0.981 (0.925–0.995)
Plaque length	0.990 (0.962–0.998)	0.997 (0.990–0.999)
Plaque area	0.986 (0.945–0.997)	0.992 (0.967–0.998)
Cross-sectional ultrasound images
Max WT	0.894 (0.631–0.973)	0.950 (0.814–0.987)
Plaque area	0.937 (0.767-0.984)	0.983 (0.932–0.996)
Longitudinal MR images
Max WT	0.886 (0.608–0.970)	0.970 (0.884–0.993)
Plaque length	0.891 (0.622–0.972)	0.927 (0.734–0.981)
Plaque area	0.965 (0.865–0.991)	0.982 (0.928–0.995)