Table 1:

Mean ± SD for rCBV histogram measures

	Grade
	II	III	IV
Median	1.14 ± 0.49	2.86 ± 1.13	2.72 ± 0.68
Mean	1.24 ± 0.47	2.90 ± 0.83	2.83 ± 0.68
SD	0.49 ± 0.32	2.31 ± 0.32	2.32 ± 0.29
Mean₅₀	1.58 ± 0.58	3.65 ± 0.93	3.63 ± 0.86
SD₅₀	0.46 ± 0.36	1.96 ± 0.31	1.94 ± 0.32
Mean₂₅	1.85 ± 0.66	4.12 ± 0.82	4.12 ± 0.81
SD₂₅	0.38 ± 0.33	1.80 ± 0.34	1.70 ± 0.33
Mean₁₀	2.18 ± 0.76	4.55 ± 0.76	4.46 ± 0.71
SD₁₀	0.35 ± 0.33	1.64 ± 0.42	1.54 ± 0.31
Skew	1.07 ± 0.83	0.46 ± 1.12	0.46 ± 0.78
Kurt	1.60 ± 3.04	0.59 ± 3.43	−0.26 ± 1.18
PH	0.22 ± 0.09	0.20 ± 0.18	0.19 ± 0.16
PP	1.10 ± 0.61	3.28 ± 1.85	3.34 ± 1.75
A1SD	0.66 ± 0.11	0.55 ± 0.20	0.55 ± 0.18

Note:—rCBV indicates relative cerebral blood volume; mean_50, mean of the top 50% of the histogram; SD₅₀, SD of the top 50%; mean₂₅, mean of the top 25%; SD₂₅, SD of the top 25%; mean₁₀, mean of the top 10%; SD₁₀, SD of the top 10%; skew, skewness; kurt, kurtosis; PH, peak height of the histogram; PP, peak position (ie, the mode); and A1SD, area under the histogram curve within 1 SD.