Latest treatment planning systems depends strongly on CT images, so the tendency is that thedosimetry procedures in nuclear medicine therapy be also based on images, such as magneticresonance imaging (MRI) or computed tomography (CT), to extract anatomical and histologicalinformation, as well as, functional imaging or activities map as PET or SPECT. This informationassociated with the simulation of radiation transport software is used to estimate internal dose inpatients undergoing treatment in ...