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首页> 外文期刊>Physics in medicine and biology. >Frequency-dependent viscoelastic parameters of mouse brain tissue estimated by MR elastography.
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Frequency-dependent viscoelastic parameters of mouse brain tissue estimated by MR elastography.

机译:MR弹性成像估计的小鼠脑组织的频率依赖性粘弹性参数。

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Viscoelastic properties of mouse brain tissue were estimated non-invasively, in vivo, using magnetic resonance elastography (MRE) at 4.7 T to measure the dispersive properties of induced shear waves. Key features of this study include (i) the development and application of a novel MR-compatible actuation system which transmits vibratory motion into the brain through an incisor bar, and (ii) the investigation of the mechanical properties of brain tissue over a 1200 Hz bandwidth from 600-1800 Hz. Displacement fields due to propagating shear waves were measured during continuous, harmonic excitation of the skull. This protocol enabled characterization of the true steady-state patterns of shear wave propagation. Analysis of displacement fields obtained at different frequencies indicates that the viscoelastic properties of mouse brain tissue depend strongly on frequency. The average storage modulus (G') increased from approximately 1.6 to 8 kPa over this range; average loss modulus (G'') increased from approximately 1 to 3 kPa. Both moduli were well approximated by a power-law relationship over this frequency range. MRE may be a valuable addition to studies of disease in murine models, and to pre-clinical evaluations of therapies. Quantitative measurements of the viscoelastic parameters of brain tissue at high frequencies are also valuable for modeling and simulation of traumatic brain injury.
机译:使用4.7 T的磁共振弹性成像(MRE)在体内非侵入性地评估小鼠脑组织的粘弹性,以测量诱导的剪切波的色散特性。这项研究的主要特征包括(i)开发和应用新型的MR兼容致动系统,该系统通过门齿将振动传递到大脑中;以及(ii)在1200 Hz范围内研究脑组织的机械特性带宽从600-1800 Hz在颅骨的连续谐波激励过程中测量了由于传播的剪切波引起的位移场。该协议能够表征剪切波传播的真实稳态模式。对在不同频率下获得的位移场的分析表明,小鼠脑组织的粘弹性质强烈依赖于频率。在此范围内,平均储能模量(G')从大约1.6 kPa增加到8 kPa。平均损耗模量(G'')从大约1 kPa增加到3 kPa。在该频率范围内,两个模量均通过幂律关系很好地近似。 MRE可能是对小鼠模型中的疾病研究和临床前治疗评估的宝贵补充。高频定量测量脑组织粘弹性参数对于创伤性脑损伤的建模和仿真也很有价值。

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