An application software program intended to add specific image processing and/or analysis capabilities to an x-ray computed tomography (CT) imaging system; it is not dedicated to radiotherapy treatment planning. A basic set of applications programs and routines are included with such computer-controlled imaging systems and they can be upgraded to correct programming errors or to add new system capabilities. Some applications software routines or groups of routines must be combined with specific hardware or firmware accessories or configurations in order to function as intended. Applications program packages are typically identified by a proprietary name and "version" or "upgrade" number.