Balanced multipoint displacement encoding for DENSE MRI.
Balanced multipoint displacement encoding for DENSE MRI.
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DOI：
10.1002/mrm.21851
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发表时间：
2009-04
影响因子：
3.3
通讯作者：
Epstein, Frederick H.
中科院分区：
文献类型：
--
作者：
Zhong, Xiaodong;Helm, Patrick A.;Epstein, Frederick H.
受激回波位移编码（DENSE）是一种定量成像技术，可在采集信号的相位中对组织位移进行编码。各种DENSE序列使用类似于相位对比（PC）MRI的简单多点方法的方法对位移进行编码。我们开发了一般的n维平衡多点编码的DENSE。与简单方法相比，使用这些方法，相位噪声方差在实验上分别降低了73.7%、65.6%和61.9%，这与1D、2D和3D编码的75%、66.7%和62.5%的理论降低非常接近。对于平衡的2D和3D编码，相位噪声协方差降低了99.2%和99.3%，与零协方差预测一致。使用平衡方法将简单方法固有的方向偏差降低到几乎为零。在体模和志愿者图像中目视观察到使用平衡方法降低的相位噪声和改善的位移和应变图。平衡多点编码也可以应用于PC MRI。
Displacement encoding with stimulated echoes (DENSE) is a quantitative imaging technique that encodes tissue displacement in the phase of the acquired signal. Various DENSE sequences have encoded displacement using methods analogous to the simple multi-point methods of phase contrast (PC) MRI. We developed general n-dimension balanced multi-point encoding for DENSE. Using these methods, phase noise variance decreased experimentally by 73.7%, 65.6%, and 61.9% compared to simple methods, which closely matched the theoretical decreases of 75%, 66.7%, and 62.5% for 1D, 2D, and 3D encoding, respectively. Phase noise covariances decreased by 99.2% and 99.3% for balanced 2D and 3D encoding, consistent with the zero-covariance prediction. The direction bias inherent to the simple methods was decreased to almost zero using balanced methods. Reduced phase noise and improved displacement and strain maps using balanced methods were visually observed in phantom and volunteer images. Balanced multi-point encoding can also be applied to PC MRI.
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影响因子：
3.3
作者：
Zhong, Xiaodong;Spottiswoode, Bruce S.;Epstein, Frederick H.
通讯作者：
Epstein, Frederick H.
影响因子：
3.3
作者：
Callot, V;Bennett, E;Wen, H
通讯作者：
Wen, H
DOI：
10.1002/jmri.1880010404
发表时间：
1991-07-01
期刊：
JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING
影响因子：
--
作者：
PELC, NJ;BERNSTEIN, MA;GLOVER, GH
通讯作者：
GLOVER, GH
影响因子：
3.3
作者：
Gilson, WD;Yang, ZQ;Epstein, FH
通讯作者：
Epstein, FH
影响因子：
2.2
作者：
Aletras, AH;Ding, SJ;Wen, H
通讯作者：
Wen, H