Answer to Question #28259 in Other Physics for Lynn

Question #28259
1. In an inversion recovery MR experiment (with a 180°-TI-90° pulse sequence) the
magnetization at t = TI is given by:
M z (t ) M 0{1 2 exp(TI /T1)}.
How much time (as a multiple of T1) is required for the magnetization to grow
essentially back to equilibrium (within a few %)? A quick and dirty approach to
measuring T1 is to determine the time t0 it takes for the magnetization to grow to 0,
i.e., Mz(t0) = 0. How are T1 and t0 related? What is the value of the magnetization
when TI = T1.
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