Comparison of two methods for the generation of spatially modulated ultrasound radiation force.
Comparison of two methods for the generation of spatially modulated ultrasound radiation force.
复制标题
两种空间调制超声辐射力产生方法的比较。
DOI：
10.1109/tuffc.2011.1954
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
McAleavey,StephenA
中科院分区：
文献类型：
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作者：
Elegbe,EtanaC;Menon,ManojG;McAleavey,StephenA
空间调制超声辐射力(S-MURF)成像是一种弹性成像技术，它涉及产生具有定义的空间频率的横向强度变化的辐射力波束。这就产生了已知波长的横波。通过使用剪切波引起的位移和标准的多普勒或散斑跟踪方法，可以估计剪切波的频率，从而估计材料的剪切模数。除了产生具有指定横向强度变化的推进光束图案之外，通常希望引起更大的位移，从而使位移数据的信噪比更高。我们分析了在弹性材料中产生S-MURF的两种波束形成方法：焦点夫琅和费法和相交平面波法。这两种技术都产生具有定义的空间频率的波束。然而，作为与每种技术相关的权衡的结果，对于相同的参数组合(例如，焦深、感兴趣区域的宽度和超声衰减系数)，感兴趣区域中的峰值声强输出是不同的。假设传感器驱动电压有限，我们提供一个决策曲线图，以确定对于特定配置，这两种技术中哪一种产生的推力更大。
Spatially modulated ultrasound radiation force (SMURF) imaging is an elastographic technique that involves generating a radiation force beam with a lateral intensity variation of a defined spatial frequency. This results in a shear wave of known wavelength. By using the displacements induced by the shear wave and standard Doppler or speckle-tracking methods, the shear wave frequency, and thus material shear modulus, is estimated. In addition to generating a pushing beam pattern with a specified lateral intensity variation, it is generally desirable to induce larger displacements so that the displacement data signal-to-noise ratio is higher. We provide an analysis of two beam forming methods for generating SMURF in an elastic material: the focal Fraunhofer and intersecting plane wave methods. Both techniques generate beams with a defined spatial frequency. However, as a result of the trade-offs associated with each technique, the peak acoustic intensity outputs in the region of interest differs for the same combinations of parameters (e.g., the focal depth, the width of the area of interest, and ultrasonic attenuation coefficient). Assuming limited transducer drive voltage, we provide a decision plot to determine which of the two techniques yields the greater pushing force for a specific configuration.