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Method and Apparatus for Compensating for B1 Inhomogeneity in Magnetic Resonance Imaging by Nonselective Tailored RF Pulses

  • US 20130038326A1
  • Filed: 04/12/2011
  • Published: 02/14/2013
  • Est. Priority Date: 04/15/2010
  • Status: Active Grant
First Claim
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1. A method of exciting nuclear spins in a body, the method comprising the steps of:

  • (a) immerging said body (PB) in a static magnetic field (B0) for aligning nuclear spins along a magnetization axis (z), said static magnetic field being substantially uniform over at least a volume of interest (VOI) of said body;

    (b) exposing said body, or at least said volume of interest, to a time-varying magnetic field gradient having components (Gx, Gy, Gz) directed along at least three non-coplanar directions (x, y, z) and to a radio-frequency non-selective pulse having a transverse polarization (B1), whereby said time-varying magnetic field gradient defines a three-dimensional trajectory in k-space constituted by straight segments linking discrete points (kT1-kT9), and said radio-frequency non-selective pulse having a transverse polarization deposits radio-frequency energy along at least part of said trajectory;

    the positions of said discrete points in k-space being determined, and the radio-frequency non-selective pulse having a transverse polarization being designed, for flipping said nuclear spins by a same predetermined flip angle, independently from their position within said volume of interest.

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