Mean transit time (MTT)

Last edit by Alaric Steinmetz on

Synonyms: MTT

The mean transit time (MTT) is a parameter for cerebral perfusion in CT perfusion. The MTT reflects the average time required for blood to perfuse a region of the brain.

Calculation

The MTT is calculated from the cerebral blood flow (CBF) and cerebral blood volume (CBV) according to the following principle: MTT = CBV / CBF 1.

Use

The mean transit time is a suitable parameter for the diagnostic evaluation of vasospasm.

Imaging

MTT CT perfusion
Image of an MTT sequence from CT perfusion.

References

    1. Laslo AM, Eastwood JD, Pakkiri P, Chen F, Lee TY. CT Perfusion-Derived Mean Transit Time Predicts Early Mortality and Delayed Vasospasm after Experimental Subarachnoid Hemorrhage. AJNR Am J Neuroradiol. October 2007:79-85. ↩ ↩

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