1. A computer-implemented method for quality assurance in radiology, comprising: retrieving quality assurance and exposure parameters from a database of a computer system; receiving information on technical variables, including radiation exposure parameters, from imaging equipment in the performance of an imaging study on an individual patient, said information which is stored in said database; determining, using a processor, whether a cumulative exposure to said individual patient exceeds a predetermined threshold stored in said database; and presenting to a user on a display, prior to another imaging study on said individual patient, at least two of the following options: 1) specialized relatively low-dose protocols, 2) imaging examinations without ionizing radiation, or 3) analysis of future imaging examination requests, on condition that said processor determines that said cumulative exposure to said individual patient exceeds said stored predetermined threshold.