SYSTEM AND METHOD FOR USING PROSPECTIVE EVALUATION OF DISPLACEMENT AND VELOCITY OF A RESPIRATORY TRACE IN A FIVE DIMENSIONAL PARAMETER SPACE TO REDUCE ARTIFACTS AND DOSAGE IN FOUR DIMENSIONAL COMPUTED TOMOGRAPHY

摘要

A displacement and velocity based prospective cine CT (PDV CT) method is disclosed for starting image acquisition if the displacement and velocity are simultaneously within predetermined tolerances, thus essentially sorting 2D CT images in a five dimensional parameter space, where displacement and the sign of the velocity are used for the temporal sorting, replacing the use of either phase or displacement as the temporal parameter during retrospective sorting, with velocity as a separate parameter correlating to some parameter of the system, e.g. the airflow rate, making it possible to do the image sorting in real-time.