Table 2 Signal intensity, echo duration and interval between signals at each site for each grade of cartilage from 20 knees
Grade 0 | Grade 1 | Grade 2 | Grade 3 | |
|---|---|---|---|---|
Signal intensity (relative value, arbitrary units) | ||||
Site A | 1.51 ± 0.863 | 1.33 ± 0.775 | 1.05 ± 0.807 | -- |
Site B | 2.60 ± 1.945 | 0.96 ± 0.433 | 0.73 ± 0.502 | -- |
Site C | -- | -- | 0.82 | 0.57 ± 0.456 |
Site D | 1.30 | 0.72 ± 0.751 | 0.52 ± 0.483 | 0.14 |
Site E | 1.30 ± 0.788 | 0.37 ± 0.230 | 0.46 | -- |
Site F | -- | -- | 0.84 ± 0.329 | 0.54 ± 0.402 |
Site G | -- | 1.18 ± 0.218 | 0.63 ± 0.420 | 0.40 ± 0.169 |
Echo duration (μs) | ||||
Site A | 1.05 ± 0.136 | 1.23 ± 0.224 | 1.34 ± 0.438 | -- |
Site B | 1.08 ± 0.201 | 1.28 ± 0.279 | 1.29 ± 0.392 | -- |
Site C | -- | -- | 1.10 | 1.11 ± 0.336 |
Site D | 1.37 | 1.08 ± 0.301 | 1.29 ± 0.490 | 1.17 |
Site E | 1.12 ± 0.220 | 1.34 ± 0.376 | 0.97 | -- |
Site F | -- | -- | 1.08 ± 0.083 | 1.04 ± 0.201 |
Site G | -- | 1.25 ± 0.220 | 1.09 ± 0.235 | 1.20 ± 0.389 |
Interval between signals (μs) | ||||
Site A | 2.60 ± 0.694 | 3.07 ± 0.597 | 3.04 ± 0.672 | -- |
Site B | 2.79 ± 0.441 | 2.82 ± 0.428 | 2.72 ± 0.562 | -- |
Site C | -- | -- | 3.05 | 1.64 ± 0.504 |
Site D | 3.90 | 3.27 ± 0.525 | 3.34 ± 0.681 | 2.39 |
Site E | 2.77 ± 0.794 | 3.09 ± 0.747 | 3.68 | -- |
Site F | -- | -- | 2.71 ± 0.787 | 1.87 ± 0.647 |
Site G | -- | 1.79 ± 0.398 | 2.67 ± 0.619 | 2.49 ± 0.553 |