TE and T2-weighting
By setting the TR to long values, the T1 effect on tissue contrast will be reduced. If TE is long enough, differences in transverse relaxation will alter tissue contrast (the T2 effect).
(But if TE is too long, the signal will have disappeared !)
Olea Medical® literature meta-analysis on CTP thresholds in acute stroke
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Olea Medical® case report on early & late MR diffusion follow-up of a stroke using CT perfusion.