Table 2.
The IVIM and DCE MR parameters of parotid glands pre-RT and post-RT
| pre-RT | post-RT | p value | |
|---|---|---|---|
| IVIM MR parameters | |||
| ADC (10−3 mm2/s) | 0.88 ± 0.15 | 1.45 ± 0.20 | <0.001a |
| D (10−3 mm2/s) | 0.72 ± 0.13 | 1.16 ± 0.21 | <0.001a |
| D* (10−3 mm2/s) | 36.3 ± 22.7 | 50.8 ± 27.4 | 0.024a |
| f (%) | 13.3 ± 3.9 | 19.2 ± 5.6 | <0.001a |
| DCE parameters | |||
| MRE (%) | 182.0 ± 41.3 | 287.1 ± 41.4 | <0.001a |
| TTP (s) | 42.4 ± 28.9 | 53.7 ± 26.0 | 0.037a |
| Wash in Rate (i/s) | 97.5 ± 44.4 | 159.8 ± 54.5 | <0.001a |
IVIM Intravoxel incoherent motion, DCE Dynamic contrast-enhanced, pre-RT Approximately 2 weeks before radiotherapy (RT), post-RT approximately 4 weeks after RT, ADC Apparent diffusion coefficient, D Pure diffusion coefficient, D* Pseudo-diffusion coefficient, f perfusion fraction, MRE Maximum relative enhancement, TTP Time to peak
adenotes a significant difference between pre-RT and post-RT parameters