Directional Filter, Local Frequency Estimate and Algebraic Inversion of Differential Equation of Psoas Major Magnetic Resonance Elastography
Directional Filter, Local Frequency Estimate and Algebraic Inversion of Differential Equation of Psoas Major Magnetic Resonance Elastography
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DOI：
10.4236/ojmi.2020.101001
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发表时间：
2020-01
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影响因子：
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通讯作者：
Surendra Maharjan;T. Numano;Tetsushi Habe;D. Ito;Takamichi Ueki;Keisuke Igarashi;Toshiki Maeno
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文献类型：
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作者：
Surendra Maharjan;T. Numano;Tetsushi Habe;D. Ito;Takamichi Ueki;Keisuke Igarashi;Toshiki Maeno
磁共振弹性成像（MRE）可以可视化剪切波在体内组织的传播，这可以映射到粘弹性。没有研究测量的生物力学性能的PM肌肉在体内使用MRE。在这项研究中，我们评估的刚度值计算本地频率估计（LFE）和微分方程的代数反演（AIDE）在PM-MRE。对17名健康男性志愿者仰卧位后正中肌进行磁共振成像扫描。基于拉普拉斯估计（LBE）的相位包裹图像数据通过高斯带通滤波器（GBF）滤波，以及通过方向和GBF滤波。LFE（MREWave）和AIDE波反演方法被用来计算各自的弹性图。采用方向滤波法去除波浪干扰，得到平滑的波场。非DF图像的LFE计算的右PM和左PM的刚度值分别为1.39 ± 0.25 kPa和1.33 ± 0.22 kPa，而DF图像的LFE计算的右PM和左PM的刚度值分别为1.26 ± 0.20 kPa和1.18 ± 0.28 kPa。非DF图像的AIDE计算的右PM和左PM的刚度值分别为0.78 ± 0.10 kPa和0.78 ± 0.13 kPa，而DF图像的右PM和左PM的刚度值分别为0.73 ± 0.12 kPa和0.74 ± 0.11 kPa。在应用/不应用方向滤波器的情况下，刚度平均值无统计学显著差异，而LFE和AIDE之间的刚度平均值存在统计学显著差异。LFE和AIDE均可用于腰大肌MR弹性成像。
Magnetic resonance elastography (MRE) can visualize the shear wave propagation of in vivo tissues, which can be mapped into viscoelastic properties. No study has measured the biomechanical properties of the PM muscle in vivo using MRE. In this study, we evaluated stiffness values calculated by local frequency estimate (LFE) and algebraic inversion of differential equation (AIDE) in PM-MRE. The PM muscles of 17 healthy male volunteers were scanned in supine position by MRE. The Laplacian-based estimate (LBE) phase wrapped image data were filtered by gaussian-bandpass filter (GBF), and by both directional and GBF. LFE (MREWave) and AIDE wave inversion methods were used to calculate the respective elastograms. The wave interferences were removed by directional filtering, and smooth wave fields were obtained. The stiffness values calculated by LFE of non-DF images were 1.39 ± 0.25 kPa and 1.33 ± 0.22 kPa for right and left PM respectively, whereas for DF images, they were 1.26 ± 0.20 kPa for right PM and 1.18 ± 0.28 kPa for left PM. The stiffness values calculated by AIDE of non-DF images were 0.78 ± 0.10 kPa and 0.78 ± 0.13 kPa for right and left PM respectively, whereas for DF images, they were 0.73 ± 0.12 kPa for right PM and 0.74 ± 0.11 kPa for left PM. There was no statistically significant difference in mean values of stiffness with/without applying directional filter whereas there was a statistically significant difference in mean values of stiffness between LFE and AIDE. Both LFE and AIDE could be used for psoas major MR Elastography.