Table 4.
Correlations of quantitative DWI and PWI parameters after TACE with tumor regression rate of HCC patients
| Parameter | Tumor regression rate
|
|
|---|---|---|
| r | P-value | |
| MTD (cm) | −0.238 | 0.010 |
| ADC (×10−3 mm2/s) | 0.308 | 0.001 |
| Dslow (×10−3 mm2/s) | 0.199 | 0.030 |
| Dfast (×10−3 mm2/s) | −0.239 | 0.009 |
| f (%) | −0.097 | 0.294 |
| Ktrans (/min) | −0.241 | 0.009 |
| Kep (/min) | −0.206 | 0.025 |
| Ve | −0.084 | 0.366 |
Abbreviations: DWl, diffusion-weighted imaging; PWi, perfusion-weighted imaging; TACE, transcatheter arterial chemoembolization; HCC, hepatocellular carcinoma; MTD, maximum tumor diameter; ADC, apparent diffusion coefficient; Dslow, slow ADC; Dfast, fast ADC; f, fraction of fast ADC; Ktrans, transfer constant of vessel at the maximum level; Kep, rate constant of backflux; Ve, extra-vascular space fractional volume.