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Regularized inversion of the laplace transform for series of experiments.
Magnetic Resonance in Chemistry : MRC 2019 January 23
Not only in Low-Field NMR, Laplace inversion is a relevant and challenging topic. Considerable conceptual and technical progress has been made, especially for the inversion of data encoding two decay dimensions. Distortion of spectra by overfitting of even moderate noise is counteracted requiring a priori smooth spectra. In this contribution, we treat the case of simple and fast one-dimensional decay experiments which are repeated many times in a series in order to study the evolution of a sample or process. Incorporating the a priori knowledge that also in the series dimension evolution should be smooth, peak position can be stabilized and resolution improved in the decay dimension. It is explained how the standard one-dimensional regularized Laplace inversion can be extended quite simply in order to include regularization in the series dimension. Obvious improvements compared to series of one-dimensional inversions are presented for simulated as well as experimental data. For the latter, comparison with multi-exponential fitting is performed.
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