A method for the simultaneous detection of speed - and acceleration distribution in moving fluids pass

摘要

A method for the simultaneous detection of numerous components of motion of a material in a subject, comprising the steps of:a) placing the subject in a magnetic field, in order to polarize nuclear spins,b) applying a high frequency (hf) - pulse with a selected frequency and amplitude,c) applying a disks - selective magnetic field gradient in a direction perpendicular to a selector disk to be imaged simultaneously with the application of the rf pulse, and nutate of the oscillating cores or. ''Nuclear spins'' in a disk of the subject, wherein transverse spin magnetisation is caused,d) the application of a speed - coding magnetic field - gradient pulse with the selected polarity in a speed - coding direction on the subject, wherein the transverse spin magnetisation experiences a phase shift caused by speed,e) the application of a phase coding pulse with a plurality of zero crossings of a magnetic field of - gradient pulse is at a selected amplitude, which causes a phase shift proportional to the acceleration and in a phase-encoding direction, the selection of the direction of the disks and the speed - coding the direction of the independent,f) the application of a readout - magnetic field - gradient pulse in a..