B1 METHOD AND APPARATUS FOR COMPENSATING FOR B1 INHOMOGENEITY IN MAGNETIC RESONANCE IMAGING BY NONSELECTIVE TAILORED RF PULSES

摘要

A method of exciting nuclear spins in a body comprising the steps of: (a) applying a magnetic field to a substantially uniform static magnetic field (B) for at least a target volume (VOI) of the body to align a nuclear spin along a magnetization axis₀Immersing said body (PB) in said container; (b) directing said body or at least said volume of interest to at least three non-coplanar directions (x, y, z)_x, G_y, G_z) And a transverse high-frequency field (B_One), Such that the time-varying magnetic field gradient causes discrete points k_T^One-k_T⁹Wherein the transverse high frequency field defines a three dimensional trajectory in a k-space comprised of segments connecting the nucleus spins in the target volume, wherein the transverse high frequency field is independent of the position of the nuclear spins in the subject volume, A method is disclosed that includes accumulating high frequency energy along at least a portion of the locus to flip the nuclear spin. A method of performing magnetic resonance imaging comprising exciting a nuclear spin in a body to be imaged, said method being performed by performing the method. A magnetic resonance imaging scanner for performing such a method is disclosed.;