Invention Grant
US08368400B2 Magnetic resonance selective excitation method of a target distribution of magnetization with complete full integration of bloch equations for RF large angle pulses (LAP)'s that are 15 degrees or greater, without small angle approximation 有权
磁共振选择激励方法的目标磁化分布方法,对于大于15度或更大的RF大角度脉冲(LAP)的完全整体积分,无小角度逼近

  • Patent Title: Magnetic resonance selective excitation method of a target distribution of magnetization with complete full integration of bloch equations for RF large angle pulses (LAP)'s that are 15 degrees or greater, without small angle approximation
  • Patent Title (中): 磁共振选择激励方法的目标磁化分布方法,对于大于15度或更大的RF大角度脉冲(LAP)的完全整体积分,无小角度逼近
  • Application No.: US12382202
    Application Date: 2009-03-11
  • Publication No.: US08368400B2
    Publication Date: 2013-02-05
  • Inventor: Martin HaasMaxim ZaitsevJürgen Hennig
  • Applicant: Martin HaasMaxim ZaitsevJürgen Hennig
  • Applicant Address: DE Freiburg
  • Assignee: Universitaetsklinikum Freiburg
  • Current Assignee: Universitaetsklinikum Freiburg
  • Current Assignee Address: DE Freiburg
  • Agent Paul Vincent
  • Priority: DE102008015054 20080319
  • Main IPC: G01V3/00
  • IPC: G01V3/00
Magnetic resonance selective excitation method of a target distribution of magnetization with complete full integration of bloch equations for RF large angle pulses (LAP)'s that are 15 degrees or greater, without small angle approximation
Abstract:
A magnetic resonance method for using radio frequency pulses for spatially selective and frequency selective or multidimensionally spatially selective excitation of an ensemble of nuclear spins with an initial distribution of magnetization in a main magnetic field aligned along a z-axis, wherein a spin magnetization with a given target distribution of magnetization is generated, and for refocusing the spin magnetization, is characterized in that the radio frequency pulse is used as a sequence of sub-pulses of independent duration, courses of gradients and spatial and/or spectral resolution, comprising one or more large angle RF pulses with tip angles greater than or approximately equal to 15°, which generate a gross distribution of magnetization approximating the target distribution of magnetization or a desired modification of the distribution of magnetization with a mean deviation less than or approximately equal to 15°, wherein the actual effect of the LAPs on the distribution of spin magnetization before the radio frequency pulse is used is calculated by integration of the Bloch equations without small angle approximation, and one or more small angle RF pulses=SAPs with tip angles less than or approximately equal to 15° reducing the difference between the target distribution of magnetization and the gross distribution of magnetization caused by the LAPs.
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