Table 2:

Summary of the linear regression analysis for various k-values that were used to establish a CBV lesion threshold (t_lesion): t_lesion=CBV_h−kσ₁^a

k	R2	RMSE
1.0	0.02	2.33
1.5	0.31	2.30
2.0	0.57	1.92
2.5	0.72	1.47
3.0	0.71	1.37
ADC	0.99	0.61

^aCBV_h and σ are the mean and standard deviation of the healthy CBV. The quality of linear regression is expressed in coefficient of determination (R₂) and root-mean-square error.