4D CT Simulation

Four-dimensional CT is an imaging technique that provides information on organ motion during respiration. It provides a more accurate assessment of target shape and trajectory, and similar information on organs at risk. Technological advances in software and hardware for 4D simulation are likely to rapidly become available in the next few years. The ability to generate 3D CT maps of anatomy as a function of respiratory phase has important applications in treatment planning and delivery, including optimization in the presence of motion, aperture design, dose calculations to moving targets, and image guided therapy delivery.