Time to drain (TTD)

Last edit by Alaric Steinmetz on

Synonyms: TTD

Time to drain (TTD) is one of the sequences from a CT perfusion imaging. The TTD sequence has high sensitivity for the diagnosis of vasospasms and shows a strong correlation in digital subtraction angiography with the manifestation of vasospasms[^1].

Imaging

TTD CT Perfusion
Time to drain (TTD) sequence of a CT perfusion of the brain. The TTD shows symmetrically normal perfusion.
TTD perfusion deficit.
Perfusion deficits in the TTD on the left side.