Suppress Sampling Truncation Artifacts in Constant-time Type Nuclear Magnetic Resonance Experiments Using Iterative Soft Thresholding Method
Suppress Sampling Truncation Artifacts in Constant-time Type Nuclear Magnetic Resonance Experiments Using Iterative Soft Thresholding Method
复制标题
采用迭代软阈值法抑制恒定时间型核磁共振实验中的采样截断伪影
DOI：
10.11895/j.issn.0253-3820.171218
复制
发表时间：
2017
影响因子：
1.2
通讯作者：
Liu Mai-Li
中科院分区：
文献类型：
--
作者：
Jiang Bin;He Xiao-Min;Yang Yun-Huang;Zhang Xu;Zhou Xin;Li Cong-Gang;Yang Dai-Wen;Liu Mai-Li
采样截断，即在信号衰减到零之前采样结束，引入了摆动。比如影响核磁共振（NMR）光谱质量的人工制品。在多维核磁共振实验中，前几百个或更少的数据点通常是在间接维度上采样的，截断是不可避免的。去位化可以有效地抑制截断伪影的产生。扩大。线性预测也有利于减少截断伪影。最糟糕的情况是在恒定时间（CT）型实验中，信号在CT演化维度上根本没有衰减。在这篇文章中，我们提出，尽管迭代软阈值（IST）由于难以调整参数而很少使用，但它特别适合抑制CT型核磁共振实验中的截断伪影。通过仿真和实验验证了该方法的有效性。并将处理结果与最近提出的一种方法进行了比较。
Sampling truncation, i.e. sampling ends before signal decays to zero, introduces wiggle. like artifacts that impair the quality of nuclear magnetic resonance (NMR) spectra. In multidimensional (mD) NMR experiments, the first few hundred or less data points are commonly sampled in the indirect dimension, and the truncation is unavoidable. Apodization can suppress truncation artifacts with cost of line. broadening. Linear prediction is also beneficial to the reduction of truncation artifacts. The worst situation is in the constant time (CT) type experiments, where the signal doesn't decay at all in the CT evolution dimension. In this contribution we proposed that, although iterative soft thresholding (IST) was rarely used due to the difficult parameter tuning, it was particularly suitable to suppress the truncation artifacts in the CT type NMR experiments. The simulation and experiments were performed to show the performance of this method. And the processing result was compared with a method proposed recently.