空间分辨率和对比度分辨率是评价超声成像质量的两个关键因素。本文首先详细介绍了这两个关键因素；然后，深入分析了改善超声成像质量的幅度变迹、编码激励和谐波成像方法的工作原理和对图像的改善程度；最后，讨论了超声成像方法的发展趋势。%Spacial resolutiaon and contrast resolution are two of the most important factors in ultrasound imaging. Firstly, the two factors are introduced detail y. And then, the apeture apolization method, encode excitation method, and homonic imaging method, which are typical methods in ultrasound imaging, are analysised deeply. Finally, the improvement trends to ultrasound imaging are discussed.
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