A method for the MRI relaxation time measurement validation and harmonization is proposed: it relies on a phantom composed of vials filled with different concentrations of MnCl2 aqueous solutions, whose relaxation times are characterized as a function of both concentration and temperature, employing NMR techniques. The accuracy and the precision of fast mapping sequences developed for cardiac applications are better quantified through, respectively, the phantom characterization and the SD maps analysis. Scan-dependent recalibrations of the relaxation time maps can be performed relying on the ground-truth NMR values of the phantom, aiming to clinical intra- and inter-center harmonization.
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