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Table 4: 
Intraobserver and interobserver variability (n = 30 carotid arteries) of the semiautomatic segmentation method
Intraobserver Interobserver
Mean ± SD Diff Obs ICC CoV (%) Mean ± SD Diff Obs ICC CoV (%)
Vessel volume (mm³) 2606 ± 830 50 ± 244 0.96 9.4 2743 ± 848 323 ± 407 0.84 14.9
Lumen volume (mm³) 1527 ± 535 −5 ± 152 0.96 10.0 1630 ± 567 201 ± 266 0.85 16.3
Plaque volume (mm³) 1079 ± 350 55 ± 120 0.93 11.1 1112 ± 334 123 ± 164 0.84 14.7
Fibrous volume (mm³) 649 ± 178 33 ± 64 0.92 9.9 675 ± 185 86 ± 115 0.76 17.0
Lipid volume (mm³) 316 ± 114 19 ± 60 0.86 19.0 326 ± 110 39 ± 70 0.78 21.5
Calcium volume (mm³) 114 ± 120 3 ± 7 1.00 6.5 112 ± 115 2 ± 13 0.99 12.0
Fibrous proportion (%) 61 ± 8 0.5 ± 2.8 0.94 4.6 62 ± 8 0.8 ± 2.7 0.94 4.5
Lipid proportion (%) 29 ± 4 0.1 ± 3.0 0.78 10.4 29 ± 5 0.4 ± 3.0 0.80 10.2
Calcium proportion (%) 9 ± 8 −0.6 ± 1.1 0.99 11.4 9 ± 8 1.2 ± 2.0 0.96 22.0

Note:—Diff Obs indicates difference between observers.

	Intraobserver				Interobserver
	Mean ± SD	Diff Obs	ICC	CoV (%)	Mean ± SD	Diff Obs	ICC	CoV (%)
Vessel volume (mm³)	2606 ± 830	50 ± 244	0.96	9.4	2743 ± 848	323 ± 407	0.84	14.9
Lumen volume (mm³)	1527 ± 535	−5 ± 152	0.96	10.0	1630 ± 567	201 ± 266	0.85	16.3
Plaque volume (mm³)	1079 ± 350	55 ± 120	0.93	11.1	1112 ± 334	123 ± 164	0.84	14.7
Fibrous volume (mm³)	649 ± 178	33 ± 64	0.92	9.9	675 ± 185	86 ± 115	0.76	17.0
Lipid volume (mm³)	316 ± 114	19 ± 60	0.86	19.0	326 ± 110	39 ± 70	0.78	21.5
Calcium volume (mm³)	114 ± 120	3 ± 7	1.00	6.5	112 ± 115	2 ± 13	0.99	12.0
Fibrous proportion (%)	61 ± 8	0.5 ± 2.8	0.94	4.6	62 ± 8	0.8 ± 2.7	0.94	4.5
Lipid proportion (%)	29 ± 4	0.1 ± 3.0	0.78	10.4	29 ± 5	0.4 ± 3.0	0.80	10.2
Calcium proportion (%)	9 ± 8	−0.6 ± 1.1	0.99	11.4	9 ± 8	1.2 ± 2.0	0.96	22.0