Fig 1.

Comparison of the IVIM parameters of high- (WHO grades III and IV) and low-grade (WHO grades I and II) tumors. D and ADC were lower in high-grade than in low-grade tumors (D, 0.85 ± 0.40 versus 1.53 ± 0.21 × 10⁻³ mm²/s, P = .0003; ADC, 1.04 ± 0.33 versus 1.60 ± 0.21 × 10⁻³ mm²/s, P = .0007; A). D was significantly lower than the ADC in high- (P = .0010) and low-grade (P = .0004; A) tumors. D* showed wide variability and no significant differences between the high- and low-grade groups (P = .8337; B). The f was higher in high- than in low-grade tumors (21.7 ± 8.2% versus 7.6 ± 4.3%, P = .0003; C).