基于球壳聚焦阵列的超声成像检测技术研究

Research on ultrasonic imaging detection technology based on spherical shell focused array

为提高超声成像对比度和分辨力,研究了一种利用球壳聚焦阵列进行目标散射成像的方法。球壳聚焦阵列中的部分阵元发射聚焦声波,声波作用于目标后发生散射,回波被余下的阵元所接收,阵列中的发射阵元和接收阵元随机选择,以达到抑制旁瓣的作用。借助三维自动扫描机构,可获得聚焦波束沿被测物体表面的散射回波强度,从而实现对目标的成像。计算机仿真结果表明,球壳聚焦阵列可减小主瓣宽度,并有效降低聚焦波束旁瓣。水池实验结果表明,基于该阵列的散射成像方法具有亚毫米级的成像分辨力,能够获得较高对比度的图像。

In order to improve the contrast and resolution of ultrasound imaging,this paper studies a target scattering imaging method based on a spherical shell focused array.The partial array elements in the spherical shell focused array transmit the focused sound waves.When the sound waves act on the target scattering occurs,and the scattered echoes are received by the remaining array elements.The transmitting and receiving elements in the array are selected randomly to suppress the side lobes.Using the three-dimensional automatic scanning mechanism,the scattered echo intensity of the focused beam along the surface of the measured object can be obtained,then the target imaging is realized.Computer simulation results show that the spherical shell focused array can decrease the main-lobe width and effectively reduce the side lobes of the focused beam.The water tank experiment results show that the scattering imaging method based on spherical shell focused array possesses a sub-millimeter level imaging resolution and could obtain high contrast image.