Truncation artifact reduction in spectroscopic imaging using a dual-density spiral k-space trajectory
Truncation artifact reduction in spectroscopic imaging using a dual-density spiral k-space trajectory
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DOI：
10.1016/s0730-725x(02)00608-2
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发表时间：
2002-12-01
影响因子：
2.5
通讯作者：
Hu, XP
中科院分区：
文献类型：
--
作者：
Sarkar, S;Heberlein, K;Hu, XP
截断伪影出现在人类大脑的磁共振波谱成像（MRSI）由于有限的覆盖范围的k空间所必需的低信噪比的代谢物信号和有限的扫描时间。在头部的质子MRSI中，强烈的颅外脂质信号“流入”脑区域，从而污染其中代谢物的信号。这项工作提出了一种数据采集策略，以减少截断伪影的基础上扩展的k空间覆盖实现了双信噪比的战略。利用k-空间中的SNR随采样密度单调增加的事实，以有效的方式利用双密度螺旋k-空间轨迹来实现双SNR，该轨迹允许从高密度到低密度的平滑过渡。该技术被证明是有效的，在减少“出血”的颅外脂质信号，同时保留在大脑中的代谢物的SNR。(C)2002年爱思唯尔科技有限公司All rights reserved.
Truncation artifacts arise in magnetic resonance spectroscopic imaging (MRSI) of the human brain due to limited coverage of k-space necessitated by low SNR of metabolite signal and limited scanning time. In proton MRSI of the head, intense extra-cranial lipid signals "bleed" into brain regions, thereby contaminating signals of metabolites therein. This work presents a data acquisition strategy for reducing truncation artifact based on extended k-space coverage achieved with a dual-SNR strategy. Using the fact that the SNR in k-space increases monotonically with sampling density, dual-SNR is achieved in an efficient manner with a dual-density spiral k-space trajectory that permits a smooth transition from high density to low density. The technique is demonstrated to be effective in reducing "bleeding" of extra-cranial lipid signals while preserving the SNR of metabolites in the brain. (C) 2002 Elsevier Science Inc. All rights reserved.