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Table 1 MRI images of the phantom of 12 different acquisitions have been registered with three different methods

From: Low-field magnetic resonance imaging offers potential for measuring tibial component migration

Acquisition (Reference acquisition) medial-lateral migration(mm) distal-proximal migration(mm) posterior-anterior migration(mm) flexion-extension migration (deg) external-internal migration (deg) varus-valgus migration (deg)
MMRI-M
1 (2) −0.367 1.657 0.129 −1.460 0.984 0.557
2 (3) 0.241 −1.313 −0.446 0.682 0.681 1.846
3 (4) −0.158 0.711 −0.535 0.829 −0.107 −0.960
4 (5) 0.857 −0.209 0.359 −1.183 0.386 −0.952
5 (6) −0.258 −0.116 −0.424 1.623 −0.080 2.125
6 (7) 0.912 0.426 −0.428 2.272 1.039 −0.748
7 (8) −0.724 −0.525 0.885 −3.657 −0.109 −1.624
8 (9) −0.146 1.334 −0.699 0.518 0.570 0.456
9 (10) −0.084 −1.207 −0.295 −1.197 −1.780 −0.821
10 (11) 1.231 −0.372 0.985 0.775 0.712 0.291
11 (12) 0.135 0.516 −0.118 0.465 0.781 0.301
12 (1) −0.105 −0.642 −0.833 0.939 −1.252 −0.398
μ(σ) 0.128 (0.584) 0.022 (0.931) −0.118 (0.593) 0.050 (1.630) 0.152 (0.884) 0.006 (1.147)
MMRI-A
1 (2) 0.288 −0.561 1.836 1.506 0.936 −1.022
2 (3) 1.571 −2.674 −2.178 2.964 0.900 6.187
3 (4) −0.738 3.648 0.381 −2.857 0.298 −3.799
4 (5) −0.040 −2.650 −0.001 0.952 −0.840 1.247
5 (6) −1.006 −1.651 −1.670 −4.091 −0.321 3.394
6 (7) 1.210 0.226 1.094 1.968 1.573 −3.264
7 (8) 1.489 0.986 0.597 2.472 1.206 −1.856
8 (9) −2.071 0.131 −0.667 −5.606 −1.682 0.943
9 (10) −0.568 2.232 −0.203 1.584 −4.138 2.737
10 (11) 0.535 0.079 0.495 0.628 1.160 −0.290
11 (12) 1.565 −1.566 −1.880 2.888 0.125 3.453
12 (1) −0.470 1.964 1.167 −2.522 0.393 −7.439
μ(σ) 0.147 (1.172) 0.014 (1.974) −0.086 (1.284) −0.010 (2.952) −0.033 (1.595) 0.024 (3.774)
MMRI-W
1 (2) −0.326 −0.173 1.702 1.725 −0.779 −0.735
2 (3) 1.315 −0.736 −1.071 −0.359 1.727 0.665
3 (4) 0.094 0.356 −0.081 2.417 0.516 −0.291
4 (5) 0.467 −0.804 0.716 −0.789 −0.416 0.502
5 (6) −0.432 2.489 −1.456 −2.723 −0.360 −0.305
6 (7) 1.229 −3.267 0.182 4.319 0.750 0.416
7 (8) 0.196 0.690 −0.240 −2.665 0.295 0.291
8 (9) 0.369 1.619 −0.062 2.500 0.206 −0.068
9 (10) −2.113 1.378 0.618 −3.284 −2.317 −1.114
10 (11) 0.577 −1.102 −0.718 0.452 0.553 0.383
11 (12) 1.669 0.119 −1.792 1.847 1.364 2.007
12 (1) −1.414 −0.956 0.746 −2.623 −1.781 −1.790
μ(σ) 0.136 (1.100) −0.032 (1.518) −0.121 (1.012) 0.068 (2.527) −0.020 (1.189) −0.003 (0.967)
  1. This table shows the migration calculated using the MRI data of each acquisition with respect to the previous acquisition
  2. A perfect registration result would be zero migration