Time Constant Tool: y = exp(x/400)
We'll start with this simple equation: y = exp(x/400); an increasing exponential curve.
We can see the general shape of exponential growth and decay curves:
We can take the decay curve (that is, the one with the minus sign: e-x) and amend the mathematical formula in order to create equations which accurately describe the decay of transverse magnetisation (Mxy), and the recovery of longitudinal magnetisation (Mz).
Navigate below to the next equation in the list: exp (-x/400).
Remember, T1, T2 and T2* are time constants.