Table 3. Correlation between quantitative MRI parameters and volume of the whole placenta.
| Parameters | Volume | |
|---|---|---|
| r (95% CI) | P value | |
| Standard DWI parameters | ||
| ADC mean (×10–3 mm2/s) | –0.156 (–0.592 to 0.347) | 0.488 |
| ADC min (×10–3 mm2/s) | –0.231 (–0.619 to 0.304) | 0.301 |
| ADCmax (×10–3 mm2/s) | –0.141 (–0.562 to 0.193) | 0.533 |
| eADC mean | 0.171 (–0.328 to 0.592) | 0.446 |
| eADC min | –0.111 (–0.507 to 0.315) | 0.622 |
| eADC max | 0.254 (0.249 to 0.682) | 0.255 |
| DKI parameters | ||
| MD mean (×10–3 mm2/s) | 0.266 (–0.187 to 0.658) | 0.232 |
| MD min (×10–3 mm2/s) | –0.343 (–0.681 to 0.129) | 0.118 |
| MD max (×10–3 mm2/s) | 0.105 (–0.376 to 0.539) | 0. 642 |
| MK mean | 0.250 (–0.238 to 0.645) | 0.261 |
| MK min | N/A | N/A |
| MK max | 0.518 (0.1 to 0. 8) | 0.014 |
| IVIM parameters | ||
| f mean (%) | 0.509 (0.046 to 0.774) | 0.015 |
| f min (%) | –0.292 (–0.598 to 0.119) | 0.187 |
| f max (%) | N/A | N/A |
| D mean (×10–3 mm2/s) | –0.168 (–0.598 to 0.321)) | 0.456 |
| D min (×10–3 mm2/s) | –0.377 (–0.734 to 0.085) | 0.084 |
| D max (×10–3 mm2/s) | –0.220 (–0.604 to 0.234) | 0.326 |
| D* mean (×10–3 mm2/s) | –0.325 (–0.701 to 0.163) | 0.140 |
| D* min (×10–3 mm2/s) | –0.198 (–0.609 to 0.368) | 0.378 |
| D* max (×10–3 mm2/s) | N/A | N/A |
MRI, magnetic resonance imaging; CI, confidence interval; DWI, diffusion-weighted imaging; ADC, apparent diffusion coefficient; eADC, exponential ADC; DKI, diffusion kurtosis imaging; MD, diffusion coefficient; MK, diffusion kurtosis; IVIM, intravoxel incoherent motion MR imaging; f, perfusion fraction; D, pure diffusion coefficient; D*, pseudo-diffusion coefficient.