Table 1. Group-averaged changes in ADC, CBF, T2, and T1 of pixels with CBF (at 48 hours after occlusion) greater than (mean+2 s.d.) of normal (i.e., hyperperfusion pixels).

% of normal at 30 minutes after MCAO		% of normal at 48 hours after MCAO
ADC	CBF	ADC	CBF	T2	T1_pre	T1_post	T1_diff
72±4*	5±3*	101±8	263±22*	125±3*	108±6*	92±4*	16±5*

Abbreviations: ADC, apparent diffusion coefficient; CBF, cerebral blood flow; MCAO, middle cerebral artery occlusion.

T1_pre, T1_post, and T1_diff indicate T1 precontrast, postcontrast, and the difference, respectively.

^*P<0.05 compared with normal. All except for 48 hours ADC were significantly different from normal values.