激励声束聚焦形状对剪切波速度估计的影响

发布时间：2019-07-06 07:23

【摘要】：为了探究运用现有的激励及检测技术实现区域弹性成像的可行性,以及在声辐射力脉冲激励下,聚焦形状、检测点的空间位置等因素对局部剪切波速度估算的影响,运用Filed II以及有限元方法对声辐射力及组织响应情况进行了研究,并选用时域互相关方法对局部剪切波速度进行估计。结果表明,随着检测灵敏度的提高,可以实现发射2~3次激励脉冲即可对检测组织进行区域成像;使用现有的剪切波速度估计方法,浅表处与焦点深度处的剪切波速度估计值相差可达12.7%;f-number(聚焦深度/孔径)增大,可以增大成像面积,但是剪切波速度估计的准确性降低。鉴于此,提出波速修正算法,修正后波速估计值更接近理论值。以f-number为1.3为例,修正后的平均误差由3.2%降至0.6%。结果证明,现有的声辐射力激励及修正后的剪切波速度估计方法可用于区域弹性成像。
文内图片：
图片说明：典型的声强分布
[Abstract]:In order to explore the feasibility of using the existing excitation and detection technology to realize regional elastic imaging, and the influence of focusing shape and spatial position of the detection point on the estimation of local shear wave velocity under the excitation of acoustic radiation force pulse, the acoustic radiation force and tissue response are studied by Filed II and finite element method, and the time domain cross-correlation method is used to estimate the local shear wave velocity. The results show that with the increase of detection sensitivity, the regional imaging of the detection tissue can be carried out by transmitting 2 鈮，

本文编号：2510877