多阵元合成孔径聚焦超声成像研究

对多阵元合成孔径聚焦超声成像进行了全面的研究.根据声场的辐射理论推导了多阵元孔径的声压分布,并分别对单阵元、多阵元聚焦和多阵元非聚焦的声场和缺陷响应进行了仿真,发现多阵元非聚焦的声场更适合于合成孔径聚焦超声成像,并根据这个原则进行了成像实验,结果表明在远场情况下,多阵元合成孔径聚焦超声成像可以获得比单阵元合成孔径聚焦成像更高的成像质量和分辨力.

Multi-Element Synthetic Aperture Focusing Ultrasonic Imaging

The principle of multi-element synthetic aperture focusing imaging was studied. Acoustic field characteristics of multi-element aperture are derived employing the acoustics radiation theory. And simula- tion of one-element, multi-element focusing and multi-element un-focusing acoustic field and defect was re- spectively carried out. It is shown that better results can be achieved in synthetic aperture imaging in multi- element un-focusing acoustic field. Experiments were implemented based on this conclusion. The results show that better resolution and image quality can be achieved through multi-element imaging than single el- ement in the far field.