Table 4.
Correlations between change rates of parotid IVIM and DCE MR parameters
| RIVIM-PARs | RDCE-PARs | r | p value |
|---|---|---|---|
| RADC | RMRE | 0.103 | 0.550 |
| RTTP | −0.048 | 0.780 | |
| RWash in Rate | −0.006 | 0.973 | |
| RD | RMRE | 0.191 | 0.264 |
| RTTP | 0.156 | 0.364 | |
| RWash in Rate | 0.181 | 0.290 | |
| RD* | RMRE | 0.371 | 0.026a |
| RTTP | 0.396 | 0.017a | |
| RWash in Rate | 0.251 | 0.139 | |
| Rf | RMRE | −0.079 | 0.647 |
| RTTP | −0.238 | 0.162 | |
| RWash in Rate | −0.116 | 0.500 |
IVIM Intravoxel incoherent motion, DCE dynamic contrast-enhanced, r Pearson correlation coefficient, R IVIM-PARs and R DCE-PARs are the change rates of IVIM and DCE MR parameters from pre-RT to post-RT, respectively, R ADC, R D, R D*, R f, R MRE, R TTP and R Wash in Rate are the change rates of apparent diffusion coefficient (ADC), pure diffusion coefficient (D), pseudo-diffusion coefficient (D*), perfusion fraction (f), maximum relative enhancement (MRE), time to peak (TTP) and Wash in Rate from pre-RT (2 weeks before radiotherapy) to post-RT (4 weeks after RT), respectively
adenotes a significant correlation between the change rates of IVIM and DCE MR parameters