基于编码发射与自适应波束形成的超声成像
doi: 10.3724/SP.J.1146.2009.00425
Ultrasounic Imaging Based on Coded Exciting Technology and Adaptive Beamforming
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摘要: 与传统的延时叠加(DAS)波束形成的成像方法相比，Capon算法可以有效地提高医学超声成像的横向分辨率，但不能提高成像的对比度。该文提出一种新的成像方法Chirp_Capon算法，即将超声编码发射技术与Capon算法相结合，利用编码信号优异的相关特性来弥补Capon算法在对比度上的不足，从而得到了较好的成像结果。仿真结果表明相对于Capon算法，该算法不仅具有较高横向分辨率，而且可以有效提高图像的对比度和信噪比。Abstract: Compared with traditional imaging algorithm based on Delay and Sum (DAS), Capon algorithm can increase horizontal resolution of medical ultrasound image, but the contrast is not improved. A new algorithm named Chirp_Caopn is proposed in this paper, which combines ultrasound coded exciting technology with Capon algorithm, so the excellent relation of coded signal can remedy the common contrast of Capon algorithm. The simulated result shows that compared with Capon algorithm, the new algorithm not only improves the horizonta resolution, but also can give a high contrast image with less noise.
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