Inter-observer bias and agreement for regional fetal brain ADC measurements. Inter-observer LOA ranged from −8.4 to 18.8% Small differences in inter-observer bias were detected for cerebellar hemispheres (1.26 ± 0.20 vs. 1.20 ± 0.18, p = 0.006), parietal white matter (1.37 ± 0.29 vs. 1.33 ± 0.26, p = 0.02), and centrum semiovale (1.36 ± 0.29 vs. 1.33 ± 0.28, p < 0.0001). Inter-observer bias for all other regions was not significantly different from zero.