论文标题
超级分辨的剪切冲击聚焦于人头
Super-resolved shear shock focusing in the human head
论文作者
论文摘要
最近在大脑中观察到了与压缩冲击完全不同的剪切冲击。这些低相位速度（$ \ $ 2 m/s）高马赫数（$ \ $ 1）波可能是弥漫性轴突损伤背后的主要机制，这是由于电击锋处的本地加速度很高。这些波的极端非线性导致独特的行为与更常见的非线性压缩波不同。在这里，我们显示了对超级分辨剪切冲击波聚焦的首次观察。在一系列频率/振幅上，剪切冲击波成像和数值模拟显示出低应变和高应变率状态中冲击波的超分辨率。这些结果表明，即使在毫米$ $^2 $的尺寸上，也可以轻松地在大脑内部产生轻度加速损伤。
Shear shocks, which exist in a completely different regime from compressional shocks, were recently observed in the brain. These low phase speed ($\approx$ 2 m/s) high Mach number ($\approx$ 1) waves could be the primary mechanism behind diffuse axonal injury due to a very high local acceleration at the shock front. The extreme nonlinearity of these waves results in unique behaviors that are different from more commonly studied nonlinear compressional waves. Here we show the first observation of super-resolved shear shock wave focusing. Shear shock wave imaging and numerical simulations in a human head phantom over a range of frequencies/amplitudes shows the super-resolution of shock waves in the low strain and high strain-rate regime. These results suggest that even for mild accelerations injuries as small as a grain of rice on the scale of mm$^2$ can be easily created deep inside the brain.
