Figure 1

Plot of biexponential decaying signals generated by two different models. The governing equations for the models are \(\mathbf {S}_1(\mathbf {t}) = 0.2e^{-\frac{\mathbf {t}}{20}} + 0.8e^{-\frac{\mathbf {t}}{150}}\) and \(\mathbf {S}_2(\mathbf {t}) = 0.28 e^{-\frac{\mathbf {t}}{40}} + 0.7 e^{-\frac{\mathbf {t}}{163}}\).