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Optimised pulse sequences for evaluating spatial frequency content of a selectively excited internal volume

机译:优化的脉冲序列,用于评估选择性激发内部空间的空间频率含量

摘要

In a structural analysis using NMR techniques, a method for gathering k-value data from frequency encoded spin echoes generated from internal volumes selectively excited by intersecting 90° and 180° slice selective and refocusing RF pulses and subjected to a read gradient for the purpose of quantifying the spatial frequency content of the selected internal volume without contamination by a FID signal, comprising: acquiring spin echo data such that the FID signal generated by imperfections in the 180° slice selective refocusing RF pulse is attenuated by the read gradient such that any remaining FID signal is spatially encoded with higher k-values than the frequency encoded k-values being recorded for subsequent structural analysis while simultaneously providing for t2 t2* and t1 contrast. Other aspects of the invention are disclosed.
机译:在使用NMR技术的结构分析中,一种方法是从通过内部相交产生的频率编码自旋回波收集k值数据的方法,该内部体积是通过将90°和180°切片选择性相交并重新聚焦RF脉冲而有选择地激发的,并且为了达到以下目的而受到读取梯度的影响量化所选内部空间的空间频率含量而不受FID信号的污染,包括:获取自旋回波数据,以使180°切片选择性重聚焦RF脉冲中的缺陷所产生的FID信号被读取的梯度衰减,从而使任何剩余FID信号在空间上用比要记录的频率编码的k值更高的k值进行编码,以进行后续结构分析,同时提供t2 t2 *和t1对比度。公开了本发明的其他方面。

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