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.