Methods are disclosed for estimating patient radiation exposure during computerised tomography (CT) scans. The method comprises receiving a set of parameters describing the imaging scan and an image scanning apparatus being used to perform the imaging scan. Receive a deformed imaging phantom corresponding to the individual. Evaluating a plurality of previously completed simulations estimating radiation dose absorption. Interpolate the estimates of radiation dose in the two or more simulations to determine the estimate of radiation dose absorbed by the individual in receiving the imaging scan.
