[en] The use of computerized tomography in paediatrics is rapidly increasing and with that the dose received by the patients. Recent publications show that the new technique is overused and therefore the cancer risk is increasing in paediatric patients. The article discusses the strategies in use ro reduce the radiation doses without losing the advantages of the new technique. Paediatric doses can be reduced adjusting the photon beam to the density and dimensions of the paediatric patient, in new equipment modulating automatically the current and the tension in the cathodic tube to the optimum values without impairing the quality of the image. Dose can also be reduce increasing the rotation velocity and the pitch of the gantry, limiting the exploration to the region of interest and using shielding to protect the most sensitive tissues. Nevertheless, the article defends the prudent use of computerised tomography and recommends, whenever possible, the use of complementary non ionizing radiation techniques. (Author) 26 refs