Table 1.
Re-measurement error (precision) for cartilage volume (VC) from unpaired analyses represented as RMSE CV%, for each cartilage plate, analysis team and acquisition for (A) medial and lateral tibia, (B) medial and lateral central femur. The combined (pooled data) RMSE CV% for a plate and acquisition combination were computed with and without the results from outlier teams. Metrics where a significant team effect on precision was observed had outlier teams identified by results that differed significantly from at least 2 other teams in pair-wise comparisons. Two isolated test-retest pair outliers for VC were excluded (values in parentheses) from MT analyses of all three acquisitions and from LT analyses of FLASH.
| (A) Medial and Lateral Tibia (MT and LT) cartilage volume (VC) | ||||||
|---|---|---|---|---|---|---|
| MT | LT | |||||
| Analysis Team |
FLASH | DESS- MPR |
DESS | FLASH | DESS- MPR |
DESS |
| A | 5.3% | 8.0% | 14.0% (6.9%) | 4.6% | 4.8% | 10.1% |
| B | 3.5% | 4.5% | 4.2% | 4.1% | 3.5% | 4.7% |
| C | 4.0% | 3.1% | 3.6% | 6.1% | 4.3% | 8.6% |
| E | 11.2% (6.2%) | 14.6% (9.6%) | 4.9% | 11.9% (4.8%) | 19.2% | 6.3% |
| Pooled, without isolated outlier data points | 4.6% (0.56) | 6.2% (0.06) | 4.9% (0.63) | 4.9% (0.7) | - | - |
| Pooled, without outlier team | - | 5.1% 1 | - | - | 4.1% 2 | - |
| Pooled (p-value for team effect) [RMSE mm3] | 5.9% (0.38) [114.7] | 7.9% (0.027) [150.1] | 7.0% (0.73) [151.6] | 6.9% (0.60) [144.5] | 9.5% (0.002) [196.3] | 7.4% (0.19) [169.8] |
| (B) Central Medial and Lateral Femur (cMF and cLF) cartilage volume (VC) | ||||||
|---|---|---|---|---|---|---|
| cMF | cLF | |||||
| Analysis Team |
FLASH | DESS- MPR |
DESS | FLASH | DESS- MPR |
DESS |
| A | -- | 8.7% | -- | -- | 9.5% | -- |
| B | 4.8% | 4.3% | 6.8% | 6.0% | 6.2% | 5.4% |
| C | 6.7% | 5.8% | 6.5% | 5.6% | 4.9% | 6.7% |
| D | 5.1% | 5.8% | 3.5% | 4.8% | 4.0% | 3.8% |
| E | 9.1% | 7.2% | 4.6% | 8.1% | 11.1% | 11.7% |
| Pooled, without outlier team | - | 4.1% 3 | - | - | 6.0% 4 | - |
| Pooled (p-value for team effect) [RMSE mm3] | 6.8% (0.09) [79.0] | 6.4% (0.05) [72.3] | 5.5% (0.03) [65.4] | 6.4% (0.98) [78.8] | 7.7% (0.01) [86.0] | 7.7% (0.63) [89.3] |
Team B and C differ (p<0.05) from E; after outlier data point removal B–E=0.11 and C–E=0.008.
Team A, B and C differ (p<0.05) from E; after outlier data point removal A–E=0.02, B–E=0.0002, and C–E=0.02.
Team B and C differ (p<0.05) from E; after outlier data point removal B–E=0.004 and C–E=0.047.
Team A, B, C and D differ (p<0.05) from E; after outlier data point removal A–E=0.003, B–E=0.002, C–E=0.03, and D–E=0.004.