Table 5.
Diagnostic efficacy of related indexes of IVIM and PWI
| Parameter | Critical point | Sensitivity (%) | Specificity (%) | Accuracy (%) | Area under the ROC curve | |
|---|---|---|---|---|---|---|
| ADC | 0.810×10−3 (mm2/s) | 74.6 | 98.0 | 88.1 | 0.869 | |
| Dslow | 0.695×10−3 (mm2/s) | 61.2 | 90.2 | 78.0 | 0.833 | |
| Dfast | 42.97×10−3 (mm2/s) | 56.9 | 91.0 | 76.3 | 0.812 | |
| Ktrans | 1.73 (/min) | 58.2 | 90.2 | 76.3 | 0.802 | |
| Kep | 2.15 (/min) | 58.8 | 91.0 | 77.1 | 0.809 | |
Abbreviations: IVIM, intravoxel incoherent motion; PWI, perfusion-weighted imaging; ROC, receive operation curve; ADC, apparent diffusion coefficient; Dslow, slow ADC; Dfast, fast ADC; Ktrans, transfer constant of vessel at the maximum level; Kep, rate constant of backflux.