Harmonic motion detection in a vibrating scattering medium.
Harmonic motion detection in a vibrating scattering medium.
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DOI：
10.1109/tuffc.887
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发表时间：
2008-09
影响因子：
3.6
通讯作者：
Greenleaf, Jaines F.
中科院分区：
文献类型：
--
作者：
Urban, Matthew W.;Chen, Shigao;Greenleaf, Jaines F.
弹性成像是一种新兴的医学成像模式，旨在映射组织刚度的空间分布。使用脉冲回波超声的超声辐射力激励和运动跟踪已经用于许多方法中。振动测量中使用动态辐射力来引起物体或组织振动，并且可以非常准确地测量振动幅度和相位。本文提出了一个模型，模拟谐波运动检测的振动散射介质结合3-D波束形状的辐射力激励和运动跟踪。使用该模型的参数化分析提供了一个平台，以优化组织中振动测量应用的运动检测。还提出了一种产生多频辐射力的实验方法。同时多频振动的实验谐波运动检测证明使用一个单一的传感器。该方法可以准确地检测牛肌肉中位移幅度低至100至200 nm的运动。实验结果验证了模型的结论，并表明多频振动感应和测量可以同时进行。
Elasticity imaging is an emerging medical imaging modality that seeks to map the spatial distribution of tissue stiffness. Ultrasound radiation force excitation and motion tracking using pulse-echo ultrasound have been used in numerous methods. Dynamic radiation force is used in vibrometry to cause an object or tissue to vibrate, and the vibration amplitude and phase can be measured with exceptional accuracy. This paper presents a model that simulates harmonic motion detection in a vibrating scattering medium incorporating 3-D beam shapes for radiation force excitation and motion tracking. A parameterized analysis using this model provides a platform to optimize motion detection for vibrometry applications in tissue. An experimental method that produces a multifrequency radiation force is also presented. Experimental harmonic motion detection of simultaneous multifrequency vibration is demonstrated using a single transducer. This method can accurately detect motion with displacement amplitude as low as 100 to 200 nm in bovine muscle. Vibration phase can be measured within 10° or less. The experimental results validate the conclusions observed from the model and show multifrequency vibration induction and measurements can be performed simultaneously.