ROTATING FRAME GRADIENT FIELDS FOR MRI AND NMR IN LOW POLARIZING MAGNETIC FIELDS

摘要

A system and method for Fourier encoding a nuclear magnetic resonance (NMR) signal is disclosed. A static magnetic field is provided along a first direction. An NMR signal from the sample is Fourier encoded by applying a rotating-frame gradient field superimposed on the, where the comprises a vector component rotating in a plane perpendicular to the first direction at an angular frequency in a laboratory frame. The Fourier-encoded NMR signal is detected. The rotating frame gradient field according to the invention reduces distortions in Fourier encoded imaging and volume selection caused by untruncated concomitant gradients.