Table 1.
Intra-subject repeatability*.
| (T2*)short | a2 | (T2*)long | a22 | (T2*)single | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
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| ROI | Mean | SD | CV | Mean | SD | CV | Mean | SD | CV | Mean | SD | CV | Mean | i SD | CV |
| (ms) | (ms) | (%) | (%) | (ms) | (ms) | (%) | (%) | (ms) | (ms) | ||||||
| Patellar cartilage (PC) | |||||||||||||||
| Superficial | 5.02 | 0.08 | 1.6% | 34.3 | 3.2 | 9.3% | 35.8 | 2.4 | 6.7% | 81.5 | 0.1 | 0.2% | 27.0 | 1.1 | 4.0% |
| Deep | 3.79 | 0.16 | 4.2% | 66.4 | 7.4 | 11.1% | 22.1 | 1.3 | 5.9% | 42.5 | 5.3 | 12.5% | 7.8 | 0.9 | 11.5% |
| Full | 3.71 | 0.21 | 5.7% | 48.4 | 7.5 | 15.5% | 21.9 | 2.1 | 9.6% | 53.3 | 7.8 | 14.6% | 14.7 | 0.5 | 3.4% |
| Anterior articular cartilage (AAC) | |||||||||||||||
| Superficial | 3.38 | 0.25 | 7.4% | 36.3 | 0.6 | 1.7% | 44.1 | 4.1 | 9.3% | 68.9 | 2.0 | 2.9% | 18.9 | 3.0 | 15.9% |
| Deep | 1.65 | 0.06 | 3.6% | 16.6 | 0.1 | 0.6% | 32.2 | 0.3 | 0.9% | 92.1 | 1.6 | 1.7% | 29.8 | 0.8 | 2.7% |
| Full | 3.29 | 0.21 | 6.4% | 31.2 | 4.3 | 13.8% | 40.7 | 1.7 | 4.2% | 78.4 | 3.5 | 4.5% | 23.8 | 0.3 | 1.3% |
| Femoral cartilage (FC) | |||||||||||||||
| Superficial | 3.90 | 0.14 | 3.6% | 87.0 | 18.4 | 21.1% | 23.5 | 5.5 | 23.4% | 80.6 | 8.9 | 11.0% | 17.2 | 0.5 | 2.9% |
| Deep | 2.00 | 0.15 | 7.5% | 99.4 | 0.8 | 0.8% | - | - | - | - | - | - | 2.57 | 0.52 | 20.2% |
| Full | 2.84 | 0.34 | 12.0% | 89.2 | 15.2 | 17.0% | 23.5 | 5.5 | 23.4% | 80.6 | 8.9 | 11.0% | 12.0 | 1.9 | 15.8% |
| Tibial cartilage (TC) | |||||||||||||||
| Superficial | 5.84 | 0.01 | 0.2% | 34.9 | 7.7 | 22.1% | 19.7 | 0.1 | 0.5% | 91.0 | 0.6 | 0.7% | 19.9 | 0.5 | 2.5% |
| Deep | 2.24 | 0.06 | 2.7% | 77.3 | 7.8 | 10.1% | 12.6 | 0.2 | 1.6% | 65.8 | 3.5 | 5.3% | 9.4 | 0.7 | 7.4% |
| Full | 2.94 | 0.46 | 15.6% | 68.8 | 4.2 | 6.1% | 17.1 | 0.7 | 4.1% | 82.1 | 0.4 | 0.5% | 15.5 | 0.2 | 1.3% |
*
The component intensity fractions a21 and a22 do not sum up to 100% because they are not from individual voxels. Instead, they are from a ROI and averaged over the three sessions of MRI scan. CV=mean/SD.