Magnetic resonance imaging bias field correction improves tumor prognostic evaluation after transcatheter arterial chemoembolization for liver cancer

Table 3 Hazard ratios of baseline effective tumor volume, absolute effective tumor volume change, and effective tumor volume% with and without magnetic resonance bias field correction

Variable	Not using bias field correction		Use bias field correction
	Hazard ratio	P value	Hazard ratio	P value
Baseline ETV	1.063 (1.031-1.095)	< 0.001	1.165 (1.069-1.268)	< 0.001
Absolute ETV change	1.012 (0.985-1.042)	0.481	1.040 (0.935-1.160)	0.512
ETV%	1.005 (0.981-1.030)	0.793	0.665 (0.538-0.825)	< 0.001

ETV: Effective tumor volume.