Selective suppression of artifact-generating echoes in cine DENSE using through-plane dephasing
Selective suppression of artifact-generating echoes in cine DENSE using through-plane dephasing
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DOI：
10.1002/mrm.21058
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发表时间：
2006-11-01
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;Spottiswoode, Bruce S.;Epstein, Frederick H.
在具有受激回波的位移编码成像（DENSE）中，组织位移被编码在受激回波的相位中。然而，三个回波通常对所采集的信号有贡献（受激回波、受激回波的复共轭和由于T弛豫引起的回波）。通常希望抑制除受激回波之外的所有回波，因为否则附加回波将导致位移测量误差。理想情况下，伪影生成回波的抑制将与时间、T-1和位移编码频率无关，并且不需要额外的采集。在这项研究中，通过平面梯度被用来选择性地去相位伪影生成回波，而不会导致显着的信号损失的刺激回波。对电影DENSE序列进行了修改，以包括移相梯度并执行磁化的互补空间调制（CSPAMM）。对于单独使用移相的单次采集电影DENSE，伪影抑制与两次采集的CSPAMM相似。与CSPAMM一起使用移相需要两次采集，但表现出比单独使用CSPAMM或单独使用移相更大的伪影抑制。
In displacement-encoded imaging with stimulated echoes (DENSE), tissue displacement is encoded in the phase of the stimulated echo. However, three echoes generally contribute to the acquired signal (the stimulated echo, the complex conjugate of the stimulated echo, and an echo due to T, relaxation). It is usually desirable to suppress all except the stimulated echo, since otherwise the additional echoes will cause displacement measurement errors. Ideally, suppression of the artifact-generating echoes would be independent of time, T-1, and displacement-encoding frequency, and would not require additional acquisitions. In this study through-plane gradients were used to selectively dephase artifact-generating echoes without causing significant signal loss of the stimulated echo. A cine DENSE sequence was modified to include dephasing gradients and perform complementary spatial modulation of magnetization (CSPAMM). For single-acquisition cine DENSE using dephasing alone, artifact suppression was similar to CSPAMM with two acquisitions. The use of dephasing with CSPAMM required two acquisitions, but demonstrated greater artifact suppression than CSPAMM alone or dephasing alone.