Sample interval modulation for the simultaneous acquisition of displacement vector data in magnetic resonance elastography: theory and application.
Sample interval modulation for the simultaneous acquisition of displacement vector data in magnetic resonance elastography: theory and application.
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DOI：
10.1088/0031-9155/58/24/8663
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发表时间：
2013-12-21
影响因子：
3.5
通讯作者：
Magin RL
中科院分区：
文献类型：
--
作者：
Klatt D;Yasar TK;Royston TJ;Magin RL
引入采样间隔调制-磁共振弹性成像（SLIM-MRE），用于同时编码单频振动的所有三个位移投影到MR信号相位。在SLIM-MRE中，使用不同的样本间隔来观察单个位移分量。在这样做的过程中，这些分量在MR信号相位中以不同的表观频率进行调制，这些频率表示为运动编码梯度开始时间的谐波函数，因此可以通过对采样的多向MR相位进行傅里叶变换来分解。在这项工作中，提出了SLIM-MRE的理论基础，并利用高场（11.7 T）垂直孔磁共振成像系统在非均匀琼脂糖凝胶幻影样品上实现了新的思想。在误差范围内，新的slimm -MRE方法和传统MRE方法的局部频率估计导出的刚度值相同，而每项研究所需的时间分辨MRE实验数量从3个减少到1个。在这项工作中，我们首次提出了沿三个敏化方向同时获取并存储在同一k空间中的单频位移数据。
SampLe Interval Modulation -magnetic resonance elastography (SLIM-MRE) is introduced for simultaneously encoding all three displacement projections of a monofrequency vibration into the MR signal phase. In SLIM-MRE, the individual displacement components are observed using different sample intervals. In doing so, the components are modulated with different apparent frequencies in the MR signal phase expressed as a harmonic function of the start time of the motion encoding gradients and can thus be decomposed by applying a Fourier transform to the sampled multidirectional MR phases. In this work, the theoretical foundations of SLIM-MRE are presented and the new idea is implemented using a high field (11.7 T) vertical bore magnetic resonance imaging system on an inhomogeneous agarose gel phantom sample. The local frequency estimation-derived stiffness values were the same within the error margins for both the new SLIM-MRE method and for conventional MRE, while the number of temporally-resolved MRE experiments needed for each study was reduced from three to one. In this work, we present for the first time, monofrequency displacement data along three sensitization directions that were acquired simultaneously and stored in the same k-space.
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通过磁共振弹性成像确定阿尔茨海默氏病的大脑硬度降低。
影响因子：
4.4
作者：
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DOI：
10.1073/pnas.1200151109
发表时间：
2012-04-24
影响因子：
11.1
作者：
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通讯作者：
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影响因子：
4.4
作者：
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影响因子：
56.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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