Loya‐Olivas1 and Loya‐Olivas2: two models based on the Linear Acceleration of Sparse and Adaptive Diffusion Dictionary (LASADD) technique. Loya‐Olivas1 uses the DBF signal model, while Loya‐Olivas2 uses a three‐compartment tissue model. The optimization uses linearized signal models to speed up computation and sparseness constraints to regularize.