The rapid and far-reaching technological evolution that has taken place in diagnostic imaging has deeply changed the radiologist's role, increasing his professional liability. He is in fact responsible for the materials and the equipment employed, for the choice of the examination necessary to solve the clinical problems, for the proper execution of the test, for the validity of the iconographic documentation, for the correct diagnostic interpretation and final report. Whenever the instrumental research involves actual risks of damage (not only potential) it is up to the radiologist to inform the patient to obtain the consent for the execution of the test.