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Measurement of local wavelength using MR elastography with multiple phase offsets

机译：使用具有多相偏移的MR EleSography的局部波长测量

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Magnetic resonance elastography (MRE) is a phase-contrast-based MR method that can visualize propagating strain waves in materials. The quantitative values of shear modulus can be calculated by estimating the local wavelength (LW) of the wave pattern. Low frequency mechanical motion must be used for soft tissue-like materials, because strain waves rapidly attenuate as higher frequency. Therefore, it is difficult to estimate LW with high spatial resolution especially from noisy MRE image. In the MRE sequence, motion-sensitizing gradient (MSG) is synchronized with the mechanical cyclic motion. MRE images with multiple phase offsets can be generated with increasing delays between MSG and the mechanical excitation. In this report, we describe the new algorithm in order to measure LW in higher spatial resolution using MRE images with multiple phase offsets. This method was evaluated by the computer simulation and the phantom study. The result shows LW was successively estimated.
机译：磁共振弹性成像（MRE）是一种基于相位对比的MR方法，可以在材料中可视化传播应变波。可以通过估计波形图案的局部波长（LW）来计算剪切模量的定量值。低频机械运动必须用于软组织样材料，因为应变波迅速衰减为更高的频率。因此，难以估计具有高空间分辨率的LW，特别是来自嘈杂的MRE图像。在MRE序列中，运动激发梯度（MSG）与机械循环运动同步。可以在MSG与机械激发之间的延迟增加时产生具有多个相位偏移的MRE图像。在本报告中，我们描述了新的算法，以便使用具有多个相位偏移的MRE图像来测量较高空间分辨率的LW。通过计算机仿真和幻像研究评估该方法。结果显示LW被连续估计。

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