FIRST-DATA-POINT PROBLEM AND THE BASE-LINE DISTORTION IN FOURIER-TRANSFORM NMR-SPECTROSCOPY WITH SIMULTANEOUS SAMPLING
FIRST-DATA-POINT PROBLEM AND THE BASE-LINE DISTORTION IN FOURIER-TRANSFORM NMR-SPECTROSCOPY WITH SIMULTANEOUS SAMPLING
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DOI：
10.1006/jmra.1994.1108
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发表时间：
1994-06-01
期刊：
影响因子：
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通讯作者：
STARCUK, Z
中科院分区：
文献类型：
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作者：
STARCUK, Z;BARTUSEK, K;STARCUK, Z
在线性相位校正后的光谱中经常出现的基线失真通常归因于自由感应衰减的第一个采集数据点的不适当值。然而，除非满足某些非常特殊的条件，否则通过将该值乘以取决于激励序列定时的特定因子来校正该值并不可靠。在这篇文章中，这些失真的起源是彻底检查在频域和时域。结果表明，这个问题可以解释为一般作为线性相位校正的结果的原始信号的不适当的rescording。提出了一种避免这些工件的方法。然而，它示出，通常适当的校正必须以复杂的方式影响整个信号，并且实验的合适的时间是非常可取的。(C)1994年出版社出版。
The,baseline distortions often arising in spectra after linear phase correction have often been attributed to an improper value of the first acquired data point of the free-induction decay. However, correction of this value by multiplying it by a certain factor depending on the timing of the excitation sequence has not proved to be reliable unless some very specific conditions are met. In this article, the origin of these distortions is thoroughly examined in both the frequency and the time domain. It is shown that the problem can be explained generally as an improper resampling of the original signal as a result of the linear phase correction. A way of avoiding these artifacts is proposed. However, it is shown that generally the proper correction must affect the whole signal in a complex way and that suitable timing of the experiment is highly desirable. (C) 1994 Academic Press, Inc.