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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=C̅B̅V̅_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


↵a C̅B̅V̅_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.
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