超声辐射力弹性成像微小应变检测

发布时间：2018-10-24 10:40

【摘要】：针对微小应变在超声辐射力弹性成像中检测困难的问题,提出了一种应变累积计算的方法。该方法在相位自相关算法检测应变的基础上,将反映应变的相位表示为复数辐角,利用复数相乘时辐角相加的原理对应变进行累积。使用该方法对弹性模型受超声辐射力激励前后的信号进行应变检测,得到了模型的应变曲线,并最终形成弹性图像。实验结果与使用传统自相关算法相比,提高了微小应变的检测精度,有更好的信号平滑效果。
[Abstract]:Aiming at the difficulty of detecting micro strain in ultrasonic force elastic imaging, a method of strain accumulation calculation is proposed. Based on the detection of strain by phase autocorrelation method, the phase reflecting strain is expressed as complex amplitude angle, and the strain is accumulated by the principle of additive of amplitude angle when multiplying the complex number. This method is used to detect the strain of the elastic model before and after being excited by ultrasonic radiation. The strain curve of the model is obtained and the elastic image is finally formed. Compared with the traditional autocorrelation algorithm, the experimental results improve the precision of micro-strain detection and have better signal smoothing effect.
【作者单位】：四川大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(30970781;81301286) 四川省科技支撑计划资助项目(2014GZ0005)
【分类号】：TN911.7

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