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Table 2: Median values of the maximal perfusion parameters and coefficient of variation for different grades of gliomas using a 3D gradient-recalled echo sequence on a 3T MR scanner
No. K^trans_ϕ(min⁻¹) (95% CI) CV(%) K^trans_SI(min⁻¹)  (95% CI) CV(%) V_{p_}ϕ (mL/100 g)  (95% CI) CV(%) V_{p_}SI (mL/100 g)  (95% CI) CV(%)
Grade 2 1 0 0 0 0 
Not defined Not defined Not defined Not defined 
Grade 3 5 0.032 122 0.026 131 0.98 54 3.9 57
Not defined Not defined Not defined Not defined 
Grade 4 9 0.069 (0.047–0.096) 45 0.15 (0.082–0.31) 72 2.4 (1.3–5.6) 59 12.5 (5.5–25) 70

	No.	K^trans_ϕ(min⁻¹) (95% CI)	CV(%)	K^trans_SI(min⁻¹) (95% CI)	CV(%)	V_{p_}ϕ (mL/100 g) (95% CI)	CV(%)	V_{p_}SI (mL/100 g) (95% CI)	CV(%)
Grade 2	1	0		0		0		0
		Not defined		Not defined		Not defined		Not defined
Grade 3	5	0.032	122	0.026	131	0.98	54	3.9	57
		Not defined		Not defined		Not defined		Not defined
Grade 4	9	0.069 (0.047–0.096)	45	0.15 (0.082–0.31)	72	2.4 (1.3–5.6)	59	12.5 (5.5–25)	70