Introduction High radiation doses received, especially in young patients, have a great importance with the known risk cancer development. Computed Tomography examinations correspond to 70% of all radiation doses in diagnostic imaging modalities. With advances in CT scanners, some features such as automatic tube current modulation (ATCM) permits acquiring high quality images with low radiation doses. However, without an optimization process, the protocols used in CT routine induce low-quality images that compromise the reliable medical diagnosis or induce radiation doses questioning the ALARA principle. Purpose The purpose of this study was to evaluate the radiation dose of fixed mA techniques and tube current modulation techniques in CT the abdomen-pelvis protocol. Material and methods We fixed three current protocols (300 mA, 250 mA and 200 mA) and one ATCM protocol (SD 10.0) performed in a 16-slice Toshiba CT scanner with “SureExposure3D” ATCM system. Protocols were applied in an anthropomorphic phantom (Alderson-Rando Phantom) for a dosimetric evaluation and to determine organ absorbed doses. The effective doses, E , were also calculated according to ICRP 103. Results The ATCM technique SD 10.0 has the lowest amount of absorbed dose. The larger E was found in the protocol with 300 mA. The difference to the SD protocol 10.0, which showed lower E , was of 79.49%. Conclusion ATCM protocols can be an excellent alternative to dose reduction in CT scans, since it does not impair the diagnostic image quality. Disclosure The authors declare that there is no conflict of interests.