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Perfusion and diffusion MR parameter ratios for infarct core (region 1), penumbra that infarcts (region 2), and hypoperfused tissue that recovers (region 3)
Parameter Region 1 Region 2 Region 3 P Value^*
Perfusion 
 rCBF 0.32 ± 0.11 0.46 ± 0.13 0.58 ± 0.12 <.001
(0.16–0.61) (0.24–0.79) (0.36–0.84) 
 rCBV 0.56 ± 0.21 0.80 ± 0.25 0.91 ± 0.18 .056
(0.16–0.88) (0.43–1.44) (0.53–1.21) 
 MTT 1.70 ± 0.42 1.74 ± 0.42 1.65 ± 0.43 .484
(0.93–2.70) (0.89–2.62) (0.65–2.70) 
Diffusion 
 ADC 0.63 ± 0.12 0.90 ± 0.11 0.96 ± 0.05 .018
(0.45–0.93) (0.69–1.12) (0.85–1.06) 
 DWI 1.84 ± 0.41 1.13 ± 0.08 1.08 ± 0.07 .014
(1.07–2.71) (1.02–1.34) (0.95–1.22) 
 FA 1.13 ± 0.20 1.02 ± 0.10 1.02 ± 0.06 .862
(0.83–1.64) (0.84–1.18) (0.92–1.10) 
Note.—DWI indicates DW image signal intensity. Data are mean ratios ± SD.
Numbers in parentheses are the range.
* P values are for the comparison between region 2 and region 3.