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Evaluation of a material parameter extraction algorithm using MRI-based displacement measurements

机译:使用基于MRI的位移测量评估材料参数提取算法

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The performance of an inversion algorithm is investigated when applied to measured displacement data for a determination of the material parameters Λ+2Μ/Ρ (longitudinal wave velocity squared) and Μ/Ρ (shear wave velocity squared) throughout an inhomogeneous test phantom. The vector displacement components throughout a test phantom subject to monochromatic shear excitation measured in time using magnetic resonance imaging (MRI) were temporally Fourier transformed to extract the component of monochromatic excitation, and the data was delivered to the inversion algorithm. A series of inversions is presented demonstrating the effects of subsequent wavenumber filtering, polarization selection, and variation in the size of the incremental volume elements. The resulting performance is assessed, and recommendations for future efforts are discussed.
机译:当将反演算法应用于测量的位移数据以确定整个非均匀测试体模中的材料参数Λ+2Μ/Ρ(纵向波速平方)和Μ/Ρ(剪切波速平方)时,将研究反演算法的性能。将使用磁共振成像(MRI)及时测量单色剪切激励的整个测试体模中的矢量位移分量进行时间傅立叶变换,以提取单色激励的分量,并将数据传递给反演算法。提出了一系列反演,证明了随后的波数滤波,极化选择和增量体积元素大小变化的影响。对由此产生的性能进行评估,并讨论未来的建议。

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