1. A method for characterizing ultrasound scatterers in a medium, the method comprising: receiving ultrasound data by an ultrasound receiver of a system for characterizing ultrasound scatterers representing a region of interest comprising a plurality of scatterers in a medium, the plurality of scatterers including aggregates of the scatterers; modelling the ultrasound data by a processor of the system for characterizing ultrasound scatterers using an effective medium theory combined with the structure factor model, the structure factor model defining the spatial organization and concentration of the aggregates; comparing the modeled ultrasound data to theoretical data obtained with the effective medium theory combined with the structure factor model; and determining from the comparison dimensional data of the aggregates of the scatterers and the volume concentration of scatterers in the medium.