METHOD AND MAGNETIC RESONQNCE BASED APPARATUS FOR DETERMINING MOVEMENT INSIDE OF A PART OF EXAMINED PERSON WITHOUT SURGICAL OPERATION

摘要

A technique for generating "optimal" radio frequency pulses for use in creating SPAMM imaging stripes and for quantitatively determining the displacements of the imaging stripes during a pre-imaging interval. The imaging operator selects the desired stripe parameters (304) so that the resulting SPAMM imaging stripe will have the desired narrowness, sharpness, flatness and the like. These parameters are then used by an optimal pulse generating system (212) to generate the input radio frequency pulse sequence which will produce the desired stripes. Tagging of the heart wall or some other soft tissue structure with a grid of planes of altered magnetization is then used to provide finite element analysis to quantify regional heart wall motion and the like. The intersections of the tagging stripes are used as a set of fiducial marks within the heart wall, and the motion of these intersections through the heart cycle is used to track the motion of the underlying tissue.