Ultrasound vibrometry using orthogonal- frequency-based vibration pulses.
Ultrasound vibrometry using orthogonal- frequency-based vibration pulses.
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DOI：
10.1109/tuffc.2013.6644739
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Chen S
中科院分区：
文献类型：
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作者：
Zheng Y;Yao A;Chen S;Urban MW;Lin H;Chen X;Guo Y;Chen K;Wang T;Chen S
开发了新的振动脉冲，用于在组织区域中产生剪切波，其具有用于超声振动测量应用的优选频谱分布。这项工作的主要目标是增加剪切波的可检测谐波的频率范围。次要目的是降低引起振动和剪切波的发射脉冲的所需峰值强度。与周期性二元振动脉冲不同，新的振动脉冲在振动的一个基本周期中具有多个脉冲。脉冲由正交频率波产生，正交频率波由几个正弦信号组成，其振幅随频率增加，以补偿组织中较高频率下的较高损耗。通过研究剪切波在离体鸡肝和猪肝中的传播，对新方法进行了评价。实验结果表明，与二元振动脉冲相比，新的振动脉冲显著增加了组织振动，同时降低了峰值超声强度。
New vibration pulses are developed for shear wave generation in a tissue region with preferred spectral distributions for ultrasound vibrometry applications. The primary objective of this work is to increase the frequency range of detectable harmonics of the shear wave. The secondary objective is to reduce the required peak intensity of transmitted pulses that induce the vibrations and shear waves. Unlike the periodic binary vibration pulses, the new vibration pulses have multiple pulses in one fundamental period of the vibration. The pulses are generated from an orthogonal-frequency wave composed of several sinusoidal signals of which the amplitudes increase with frequency to compensate for higher loss at higher frequency in tissues. The new method has been evaluated by studying the shear wave propagation in in vitro chicken and swine liver. The experimental results show that the new vibration pulses significantly increase tissue vibration with a reduced peak ultrasound intensity, compared with the binary vibration pulses.