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CT perfusion changes in various brain insults
| Etiology | CBF | CBV | MTT | TTP |
|---|---|---|---|---|
| Infarct core | ↓ | ↓ | ↑ | ↑ |
| Ischemic penumbra | Varies; usually↓ | ↑ | Varies; usually ↑ | ↑ |
| seizure | ↑ | ↑ | ↓ | ↓ |
| PRES* | Usually ↑ but can be ↓ | ↑ or ↓ | Equivocal | ↓ |
CBF = cerebral blood flow; CBV = cerebral blood volume; MTT = mean transit time; TTP = time to peak.
*= CTP changes in PRES depend on whether it is a hyperperfusion or hypoperfusion mechanism of PRES.
