This is a multicenter, observational, retrospective-prospective study designed to validate the predictive role of advanced imaging in patients with newly diagnosed multiple myeloma (NDMM). The main purpose of this study is to estimate the prevalence of radiological response categories (Response Assessment Category, RAC score) and evaluate the predictive value of relative Fat Fraction (rFF%) using Diffusion-Weighted Whole-Body Magnetic Resonance Imaging (DW-MRI) in patients who have undergone autologous stem cell transplantation (ASCT) after receiving first-line anti-CD38-based quadruplet induction therapy.