The invention relates to a method for the simulation or digital synthesis of echographic images, characterized by the direct transformation in real time, or quasi real time, of the information contained in an IRM-type medical or veterinary image, without delimitation or segmentation of the bodies or structures contained in the volume of data of the IRM image, according to at least one two-dimensional observation window which can be modified in real time, or quasi real time, in terms of the dimension, position, direction and orientation thereof, the characteristics thereof depending on the type of virtual echographic probe determined, and reproducing all of the attenuation, reflection, refraction and dispersion effects, and the regulation effects of a real echographic image, each echographic image supplied cumulating the results of the simulations of the pre-cited effects.