https://doi.org/10.1351/goldbook.08371
Time between the inversion pulse and the sampling pulse(s) in an inversion recovery sequence.
Note: \(T_{\rm{I,null}}\) is the value of \(T_{\rm{I}}\) when longitudinal magnetization (\(M_{\rm{z}}\)) is close to zero at the end of the \(\ce{TI}\) interval.