Patent ID: 6954067
Filing Date: 2005-10-11
Classification: A61B,G01R

Abstract:
1. A method for producing a magnetic resonance image indicative of spin motion, the steps comprising: a) acquiring an NMR signal with an MRI system using a three-dimensional projection reconstruction pulse sequence which includes: producing an RF excitation field; producing a motion encoding gradient field G acquiring an NMR signal while producing a readout gradient to sample a three-dimensional k-space volume along a trajectory that extends substantially radially from the center of k-space; b) producing a first k-space data set by repeating step a) using different readout gradients to sample k-space throughout the three-dimensional k-space volume along different trajectories with substantially uniform spacing between trajectories; c) producing a second k-space data set by repeating steps a), and b) using a different motion encoding gradient G d) reconstructing a first phase image from the first k-space data set; e) reconstructing a second phase image from the second k-space data set; f) producing a velocity image by combining the first and second phase images, in which the initial motion encoding gradient field G which includes repeating steps a)-c) a plurality of times using motion encoding gradient fields G