CT perfusion

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Mean Transit Time (MTT) - time difference betwen aterial inflow and venous outflow, normal is < 7

Cerebral Blood Flow (CBF) - volume of blood flow per unit of brain, normal is 50-60 mL/100g/min, 10-25 penumbra, <10 dead

Cerebral Blood Volume (CBV) - volume of blood per unit of brain, normal is 4-5 ml/100g

Time to Peak (TTP) - time between contrast injection and attenuaation peak.

Penumbra - increased MTT and decreased CBF with normal or increased CBV