TABLE 4.
Repeatability statistics of FRAPPE artery-based vessel wall measurements from Testing Set 3
| Variable | Scan* |
Difference |
Repeatability |
|||||
|---|---|---|---|---|---|---|---|---|
| First | Second | Mean | (95% CI) | CV | (95% CI) | ICC | (95% CI) | |
| Mean wall thickness, mm | 0.86 ± 0.11 | 0.87 ± 0.11 | 0.00 | (−0.01, 0.01) | 2.9% | (2.2, 3.7) | 0.95 | (0.92, 0.97) |
| Max wall thickness, mm | 2.00 ± 0.55 | 2.04 ± 0.54 | −0.04 | (−0.14, 0.06) | 12.2% | (9.4, 15.0) | 0.80 | (0.66, 0.88) |
| Mean eccentricity ratio | 1.52 ± 0.25 | 1.53 ± 0.25 | −0.01 | (−0.03, 0.01) | 3.6% | (2.5, 4.7) | 0.95 | (0.91, 0.97) |
| Mean wall area, mm2 | 19 ± 5 | 19 ± 5 | 0.1 | (−0.1, 0.4) | 3.4% | (2.6, 4.2) | 0.98 | (0.97, 0.99) |
| Mean lumen area, mm2 | 30 ± 11 | 29 ± 11 | 0.6 | (0.1, 1.1) | 4.4% | (2.8, 6.3) | 0.98 | (0.97, 0.99) |
| Mean total vessel area, mm2 | 49 ± 15 | 48 ± 15 | 0.7 | (0.1, 1.3) | 3.3% | (2.0, 4.9) | 0.99 | (0.98, 0.99) |
| Mean normalized wall index, % | 40 ± 4 | 40 ± 5 | −0.4 | (−0.8, 0.0) | 2.6% | (2.0, 3.3) | 0.94 | (0.90, 0.97) |
| Max normalized wall index, % | 50 ± 8 | 51 ± 8 | −0.3 | (−1.5, 1.0) | 6.2% | (4.7, 7.5) | 0.86 | (0.76, 0.92) |
Abbreviations: CV, coefficient of variation; FRAPPE, fully automated and robust analysis technique for popliteal artery evaluation; ICC, intraclass correlation coefficient.
*
Values are mean ± SD.