Table 1.
Texture parameters: 1.5T vs 3T
| 1.5T (n = 80) | 3T (n = 61) | P value | Q value | |||
|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | |||
| Histogram | ||||||
| Mean | 247.2 | 2.2 | 246.8 | 2.4 | 0.225 | 0.298 |
| Median | 244.7 | 4.8 | 243.4 | 5.7 | 0.170 | 0.239 |
| STD | 30.6 | 4.5 | 31.8 | 5.7 | 0.184 | 0.251 |
| Range | 8.3 | 2.8 | 7.9 | 2.4 | 0.465 | 0.554 |
| Geometric mean | 248.2 | 0.49 | 248.0 | 0.61 | 0.142 | 0.220 |
| Harmonic mean | 246.4 | 0.90 | 246.2 | 1.1 | 0.164 | 0.238 |
| 2nd STD | 2.9 | 1.0 | 2.7 | 0.84 | 0.336 | 0.432 |
| STD5 | 3.1 | 1.1 | 2.9 | 0.96 | 0.159 | 0.238 |
| STD9 | 3.2 | 1.0 | 3.2 | 0.93 | 0.892 | 0.934 |
| 4th moment | 3069652.7 | 2076989.3 | 4128044.7 | 2905848.7 | 0.018 | 0.045 |
| IQR | 39.6 | 4.3 | 39.1 | 3.8 | 0.503 | 0.580 |
| Entropy | 7.2 | 0.31 | 7.2 | 0.25 | 0.702 | 0.790 |
| GLCM | ||||||
| Entropy | 2.1 | 0.45 | 2.1 | 0.43 | 0.745 | 0.818 |
| Contrast | 16.9 | 6.5 | 18.9 | 6.6 | 0.075 | 0.143 |
| Correlation | 0.91 | 0.08 | 0.90 | 0.08 | 0.360 | 0.450 |
| Energy | 0.01 | 0.003 | 0.01 | 0.003 | 0.817 | 0.875 |
| Homogeneity | 0.60 | 0.05 | 0.59 | 0.04 | 0.940 | 0.940 |
| GLRL | ||||||
| SRE | 0.09 | 0.03 | 0.10 | 0.04 | 0.054 | 0.128 |
| LRE | 0.09 | 0.04 | 0.10 | 0.04 | 0.065 | 0.133 |
| GLN | 0.09 | 0.03 | 0.10 | 0.04 | 0.090 | 0.153 |
| RLN | 0.09 | 0.04 | 0.10 | 0.04 | 0.063 | 0.133 |
| RP | 162.1 | 42.3 | 149.4 | 41.2 | 0.076 | 0.143 |
| LGRE | 159.5 | 43.3 | 147.1 | 42.5 | 0.092 | 0.153 |
| HGRE | 157.9 | 42.6 | 146.4 | 41.7 | 0.113 | 0.182 |
| SRLGE | 159.8 | 43.4 | 147.2 | 42.5 | 0.087 | 0.153 |
| SRHGE | 3052.4 | 1691.4 | 1833.1 | 626.2 | <0.0001 | 0.0003 |
| LRLGE | 3661.3 | 2077.6 | 2100.8 | 755.5 | <0.0001 | 0.0003 |
| LRHGE | 2647.5 | 1455.7 | 1568.1 | 532.6 | <0.0001 | 0.0003 |
| Law's features | ||||||
| L1 | 162232.6 | 83374.1 | 252842.7 | 54759.9 | <0.0001 | 0.0003 |
| L2 | 18049.8 | 12630.7 | 30827.7 | 11995.7 | <0.0001 | 0.0003 |
| L3 | 6438.0 | 3814.3 | 10443.2 | 2874.5 | <0.0001 | 0.0003 |
| L4 | 33648.4 | 14046.5 | 49080.4 | 7890.0 | <0.0001 | 0.0003 |
| L5 | 6830.8 | 7083.6 | 13929.7 | 6922.4 | <0.0001 | 0.0003 |
| L6 | 5044.4 | 4893.9 | 9891.0 | 4395.4 | <0.0001 | 0.0003 |
| L7 | 3793.4 | 3264.1 | 7070.4 | 2912.7 | <0.0001 | 0.0003 |
| L8 | 10919.5 | 9724.9 | 20981.7 | 8112.5 | <0.0001 | 0.0003 |
| L9 | 15398.6 | 6675.3 | 22754.1 | 3790.9 | <0.0001 | 0.0003 |
| GLGM | ||||||
| MGR | 20.7 | 10.2 | 29.1 | 13.0 | <0.0001 | 0.0003 |
| VGR | 16410.5 | 8816.7 | 24038.9 | 11063.9 | <0.0001 | 0.0003 |
| Skewness | 7.7 | 2.0 | 6.5 | 1.9 | 0.001 | 0.003 |
| Kurtosis | 67.6 | 34.4 | 50.2 | 29.0 | 0.002 | 0.005 |
| Mean skewness | 0.64 | 0.59 | 0.72 | 0.59 | 0.468 | 0.554 |
| Mean kurtosis | 3.0 | 0.5 | 3.2 | 0.6 | 0.063 | 0.133 |
| Mean laws | 270470.4 | 141778.4 | 423628.7 | 100109.0 | <0.0001 | 0.0003 |
Mean texture analysis features on a 1.5 T vs a 3.0 T scanner. n: number of contoured slices; STD: standard deviation; STD5: 5‐neighborhood standard deviation; STD9: 9‐neighborhood standard deviation; IQR: indicates interquartile range; GLCM: gray‐level co‐occurrence matrix; GLRL: gray‐level run length; SRLGE: short‐run low gray‐level emphasis; SRHGE: short‐run high gray‐level emphasis; GLGM: gray‐level gradient matrix; SRE: short‐run emphasis; LRE: long‐run emphasis; GLN: gray‐level nonuniformity; RLN: run‐length nonuniformity; RP: run percentage; LGRE: low gray‐level run emphasis; HGRE: high gray‐level run emphasis; SRLGE: short‐run low gray‐level emphasis; SRHGE: short‐run high gray‐level emphasis; LRLGE: long‐run low gray‐level emphasis; LRHGE: long‐run high gray‐level emphasis; MGR: mean gradients; VGR: variance of gradients.
Bold indicates statistically significant as determined with the two‐tailed t test and false detection analyses (Q < 0.05).