The invention relates to a process for acquisition of one or more radiological image(s) of an object of a region of interest on a patient, obtained by means of a radiological imaging system, in which the system includes: a radiation source, a detector arranged opposite the source and at least one anti-diffusion grid, which process includes steps consisting of: determining characteristics of the object to be imaged; controlling, according to the characteristics determined, a movement of the anti-diffusion grid in order to position it in or remove it from an operational position between the object and the detector, in which the operational position corresponds to a position of the grid centered on the source-detector axis and parallel to the plane including the detector; and acquiring images of the structure exposed to the radiation emitted by the source.