Table 1.
The measurements of APTw-SI and MTR in six representative positions and intra- and inter-observer agreements
| Reader 1 | Reader 2 | Agreement | ||||||
|---|---|---|---|---|---|---|---|---|
| First measurements | Second measurements | P Value | First measurements | P Value | Intra-observer | Inter-observer | ||
|
APTw-SI: MTRasym (%) |
R1 | 3.369 ± 2.742 (1.786–4.952) | 3.424 ± 2.335 (2.076–4.772) | 0.908 | 3.180 ± 2.399 (1.795–4.565) | 0.330 | 0.862 | 0.981 |
| R2 | 3.309 ± 2.653 (1.778–4.841) | 2.652 ± 1.901 (1.555–3.750) | 0.123 | 3.383 ± 2.748 (1.796–4.970) | 0.712 | 0.883 | 0.981 | |
| R3 | 2.881 ± 2.327 (1.537–4.224) | 2.622 ± 1.821 (1.571–3.673) | 0.435 | 3.199 ± 2.941 (1.501–4.898) | 0.384 | 0.910 | 0.934 | |
| L1 | 3.442 ± 2.430 (2.039–4.845) | 3.019 ± 1.912 (1.915–4.123) | 0.356 | 3.197 ± 2.704 (1.636–4.759) | 0.224 | 0.833 | 0.980 | |
| L2 | 3.345 ± 1.989 (2.196–4.494) | 3.162 ± 2.053 (1.977–4.347) | 0.598 | 3.302 ± 1.823 (2.250–4.355) | 0.869 | 0.891 | 0.933 | |
| L3 | 2.624 ± 2.032 (1.451–3.798) | 2.314 ± 1.334 (1.543–3.084) | 0.401 | 2.591 ± 1.892 (1.499–3.684) | 0.919 | 0.821 | 0.899 | |
| MTR (%) | R1 | 38.884 ± 3.354 (36.947–40.820) | 38.660 ± 4.032 (36.332–40.988) | 0.801 | 39.194 ± 2.272 (37.882–40.506) | 0.393 | 0.763 | 0.929 |
| R2 | 30.836 ± 3.300 (28.931–32.742) | 30.189 ± 2.734 (28.611–31.768) | 0.265 | 31.207 ± 2.650 (29.677–32.737) | 0.400 | 0.867 | 0.924 | |
| R3 | 35.332 ± 2.489 (33.895–36.769) | 35.140 ± 2.014 (33.978–36.303) | 0.547 | 34.443 ± 1.946 (33.319–35.567) | 0.128 | 0.736 | 0.930 | |
| L1 | 38.856 ± 2.913 (37.174–40.537) | 38.999 ± 3.150 (37.180–40.818) | 0.846 | 38.346 ± 3.049 (36.586–40.107) | 0.319 | 0.753 | 0.895 | |
| L2 | 30.400 ± 2.432 (28.996–31.804) | 30.530 ± 2.608 (29.024–32.036) | 0.822 | 30.491 ± 2.272 (29.179–31.802) | 0.809 | 0.786 | 0.965 | |
| L3 | 32.992 ± 1.684 (32.020–33.964) | 32.944 ± 2.161 (31.697–34.192) | 0.902 | 33.114 ± 1.997 (31.961–34.267) | 0.612 | 0.842 | 0.940 | |
Note: All values were shown in arithmetic mean ± standard deviation, and the 95% confidence interval for the mean was included in parentheses. APTw-SI: amide proton transfer weighted signal intensity; MTR: magnetization transfer ratio; MTRasym: the asymmetric magnetization transfer ratio; R1: right longus capitis, R2: right tensor veli palatini, R3: right medial pterygoid, L1: left longus capitis, L2: left tensor veli palatini, L3: left medial pterygoid. P > 0.05 was considered not statistically significant.