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On the precision of time-of-flight shear wave speed estimation in homogeneous soft solids: initial results using a matrix array transducer

机译:关于均质软固体中飞行时间剪切波速度估计的精度:使用矩阵阵列换能器的初步结果

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摘要

A system capable of tracking radiation-forceinduced shear wave propagation in a 3-D volume using ultrasound is presented. In contrast to existing systems, which use 1-D array transducers, a 2-D matrix array is used for tracking shear wave displacements. A separate single-element transducer is used for radiation force excitation. This system allows shear wave propagation in all directions away from the push to be observed. It is shown that for a limit of 64 tracking beams, by placing the beams at the edges of the measurement region of interest (ROI) at multiple directions from the push, timeof- flight (TOF) shear wave speed (SWS) measurement uncertainty can theoretically be reduced by 40% compared with equally spacing the tracking beams within the ROI along a single plane, as is typical when using a 1-D array for tracking. This was verified by simulation, and a reduction of 30% was experimentally observed on a homogeneous phantom. Analytical expressions are presented for the relationship between TOF SWS measurement uncertainty and various shear wave imaging parameters. It is shown that TOF SWS uncertainty is inversely proportional to ROI size, and inversely proportional to the square root of the number of tracking locations for a given distribution of beam locations relative to the push. TOF SWS uncertainty is shown to increase with the square of the SWS, indicating that TOF SWS measurements are intrinsically less precise for stiffer materials.
机译:提出了一种能够使用超声跟踪辐射力引起的剪切波在3D体积中传播的系统。与使用一维阵列换能器的现有系统相比,二维矩阵阵列用于跟踪剪切波位移。单独的单元件换能器用于辐射力激励。该系统允许观察剪切波在远离推力的所有方向上的传播。结果表明,对于64个跟踪光束的限制,通过将光束放置在从推动开始的多个方向上感兴趣的测量区域(ROI)的边缘,飞行时间(TOF)剪切波速度(SWS)测量不确定性可以与将ROI内的跟踪光束沿单个平面等间隔放置相比,理论上可减少40%,这在使用1-D阵列进行跟踪时很常见。通过仿真验证了这一点,并在同一个体模上实验观察到减少了30%。给出了TOF SWS测量不确定度与各种剪切波成像参数之间关系的解析表达式。结果表明,对于给定的波束位置相对于推动力而言,TOF SWS不确定度与ROI大小成反比,与跟踪位置数的平方根成反比。 TOF SWS的不确定度随SWS的平方增加而增加,这表明TOF SWS的测量本质上对于较硬的材料不太精确。

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