. 2004 Mar 17;22(2):133–144. doi: 10.1002/hbm.20013

Table I.

Quality criteria measured on the Brain Web phantom with 0, 20, and 40% bias field magnitude

Brain Web	CV_WM (%)	CV_GM (%)	CJV_WG (%)	CER (%)
0% bias field	4.84	7.03	43.02	0.65
20% bias field	5.89	8.97	48.91	1.32
40% bias field	7.56	12.26	59.84	3.22

All quality parameters represent the amount of bias field in the images. CV_WM, coefficient of variation of white matter; CV_GM, coefficient of variation of the gray matter; CJV_WG, coefficient of joint variation of white and gray matter; CER, classification error rate.