Fractional encoding of harmonic motions in MR elastography
Fractional encoding of harmonic motions in MR elastography
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DOI：
10.1002/mrm.21152
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发表时间：
2007-02-01
影响因子：
3.3
通讯作者：
Sack, Ingolf
中科院分区：
文献类型：
--
作者：
Rump, Jens;Klatt, Dieter;Sack, Ingolf
在MR弹性成像（MRE）中，剪切波由双极梯度进行磁编码，双极梯度通常以与机械振动相同的频率f（v）振荡。结果，这种MIRE序列的重复时间（TR）和回波时间（TE）都大于振动周期1/f（v）。这导致在具有短横向弛豫时间的组织中的长采集时间和相当大的信号失相。在这里，我们提出了一个与TR相反的概念
In MR elastography (MRE) shear waves are magnetically encoded by bipolar gradients that usually oscillate with the same frequency f(v) as the mechanical vibration. As a result, both the repetition time (TR) and echo time (TE) of such an MIRE sequence are greater than the vibration period 1/f(v). This causes long acquisition times and considerable signal dephasing in tissue with short transverse relaxation times. Here we propose a reverse concept with TR