Research Article
Preoperatively Grading Rectal Cancer with the Combination of Intravoxel Incoherent Motions Imaging and Diffusion Kurtosis Imaging
Table 2
Diffusion parameters among different histologic grades.
| | D (×10−9 m2/s) | f | D (×10−9 m2/s) | Dapp (×10−9 m2/s) | Kapp |
| All subjects (n = 58) | 1.282 ± 0.164 | 0.237 ± 0.070 | 45.458 ± 11.801 | 1.440 ± 0.201 | 0.739 ± 0.127 | WHO grade 1 (n = 11) | 1.465 ± 0.081 | 0.292 ± 0.067 | 40.329 ± 7.399 | 1.699 ± 0.099 | 0.604 ± 0.058 | WHO grade 2 (n = 29) | 1.323 ± 0.105 | 0.244 ± 0.052 | 45.622 ± 11.187 | 1.460 ± 0.127 | 0.715 ± 0.091 | WHO grade 3 (n = 18) | 1.105 ± 0.103 | 0.192 ± 0.072 | 48.329 ± 14.239 | 1.250 ± 0.144 | 0.862 ± 0.099 | Low grade (1 and 2) (n = 40) | 1.362 ± 0.117 | 0.257 ± 0.059 | 44.166 ± 10.470 | 1.526 ± 0.161 | 0.684 ± 0.096 | High grade (3) (n = 18) | 1.105 ± 0.103 | 0.192 ± 0.072 | 48.329 ± 14.239 | 1.250 ± 0.144 | 0.862 ± 0.099 | value (grade 1 vs. grade 2) | 0.001 | 0.079 | 0.412 | <0.001 | 0.003 | value (grade 1 vs. grade 3) | <0.001 | <0.001 | 0.182 | <0.001 | <0.001 | value (grade 2 vs. grade 3) | <0.001 | 0.018 | 0.721 | <0.001 | <0.001 | value (low grade vs. high grade) | <0.001 | 0.002 | 0.276 | <0.001 | <0.001 |
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※D: true diffusion coefficient, D: pseudodiffusion coefficient, Dapp: apparent diffusion coefficient derived from DKI, f: perfusion fraction, Kapp: apparent diffusion kurtosis coefficient. |