1. A method for determining absorbed dose information, comprising: a.) generating at least one anatomy image relating to anatomy of a particular patient using at least one tomography imaging device; b.) generating multiple radioactivity images regarding radioactivity distribution of an internally administered pharmaceutical over time in the particular patient using the at least one tomography imaging device; c.) registering the radioactivity images related to the radioactivity distribution over time; d.) combining each radioactivity image with each anatomy image to create activity images; d.) running a Monte Carlo simulation for each activity image to obtain absorbed dose-rate images of the pharmaceutical at multiple times; f.) integrating the absorbed dose-rate images over time to obtain a total absorbed dose image; g.) using the absorbed dose-rate images and-total absorbed dose image to obtain a biologically effective dose (BED) image; and h.) using the BED image to obtain an equivalent uniform dose (EUD) of BED values for a chosen anatomical region, wherein steps c.) through h.) are performed by a computer.