Gradient moment compensated magnetic resonance spectroscopic imaging.

Gradient moment compensated magnetic resonance spectroscopic imaging.
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DOI:
10.1002/mrm.21832
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发表时间:
2009-02
影响因子:
3.3
通讯作者:
Spielman, Daniel M.
Spielman, Daniel M.
中科院分区:
医学3区
文献类型:
--
作者:
Kim, Dong-Hyun;Gu, Meng;Spielman, Daniel M.

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由于固有的长扫描时间和对运动的敏感性,大脑外部的光谱成像应用可能会受到伪影的影响。设计了一种快速光谱成像序列,降低了对运动的敏感度。该序列使用振荡读出梯度并​​以螺旋出入方式采集 k 空间数据,从而实现快速 k 空间覆盖。我们表明,螺旋出入读出采集的特点是梯度矩小,降低了对运动引起的伪影的敏感性。将序列与正相编码光谱成像和传统螺旋光谱成像方案进行比较,获取数据。此外,从肝脏获取体内数据,证明了作为多体素脂肪/水光谱成像工具的潜在用途。结果表明,在存在运动的情况下,重影效应会减少,而代谢信号可增加约 10%。
Spectroscopic imaging applications outside of the brain can suffer from artifacts due to inherent long scan times and susceptibility to motion. A fast spectroscopic imaging sequence has been devised with reduced sensitivity to motion. The sequence uses oscillating readout gradients and acquires k-space data in a spiral out–in fashion, which allows fast k-space coverage. We show that a spiral out–in readout acquisition is characterized by small gradient moments, reducing sensitivity to motion-induced artifacts. Data are acquired comparing the sequence to normal phase encoded spectroscopic imaging and conventional spiral spectroscopic imaging protocols. In addition, in vivo data are acquired from the liver, demonstrating potential usage as a multivoxel fat/water spectroscopic imaging tool. Results indicate that in the presence of motion, ghosting effects are reduced while metabolite signal increases of approximately 10% can be achieved.
DOI: 10.1002/mrm.1910390606
发表时间: 1998-06-01
影响因子: 3.3
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