用于非原位NMR光谱和使用B1非均匀性成像的RF匀场脉冲
RF Shimming Pulses For Ex-Situ NMR Spectroscopy and Imaging Using B1 Inhomogeneities
摘要:
我描述了一种方法,用于产生“匀场脉冲”的NMR光谱和成像(MRI),利用固有的不均匀性,在静态和射频(RF)领域的一个片面的NMR系统。在不失一般性的情况下,这里假设RF不均匀性是线性梯度。空间变量中的一般多项式可以使用x、y和z RF梯度使用硬脉冲串来生成,其导致单项式xy、y2、xz等的线性组合,以及这些单项式的任何期望的缩放。基本匀场脉冲是使用小锥角近似构造的。
英文摘要:
I describe a method for generating "shim pulses" for NMR spectroscopy and imaging (MRI) by taking advantage of the inherent inhomogeneity in the static and radiofrequency (RF) fields of a one-sided NMR system. The RF inhomogeneity here is assumed, without loss of generality, to be a linear gradient. General polynomials in the spatial variables can be generated using x, y and z RF gradients using trains of hard pulses which result in linear combinations of monomials xy, y^2, xz etc., and any desired scalings of these monomials. The basic shim pulse is constructed using small tip angle approximations.
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