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| 环形阵列超声平面波成像自适应波束形成方法 |
| Adaptive beamforming method for ultrasonic plane wave imaging using circular array |
| 投稿时间：2025-05-07 修订日期：2025-05-19 |
| 中文摘要: |
| 针对超声计算机断层扫描中环形阵列扫描、成像时间长的问题，论文基于平面波发射的反射波成像方法，研究自适应波束形成方法提升图像质量。分别采用延时叠加、基于特征空间的最小方差、延时相乘叠加等波束形成方法，与相干复合算法融合，并进一步提出一种时空相关矩阵特征空间最小方差波束形成算法。线靶成像实验结果表明，与单阵元发射相比，平面波发射可显著提升图像对比度；在各种波束形成方法中，基于特征空间的最小方差与相干复合算法融合可得到较高的分辨率和对比度，与常规的延时叠加算法相比，对比度提升了9dB，周向和径向分辨率均提高了0.8mm。改进的时空相关矩阵特征空间最小方差波束形成算法进一步提升了成像质量，分辨率提高0.3mm，对比度提高10dB以上。人体上臂成像实验验证了上述成像算法的实际应用效果。 |
| 英文摘要: |
| In ultrasound computed tomography (UCT), the use of a ring array for scanning often results in long imaging times. This study proposes a plane-wave transmission and reflection imaging method, combined with adaptive beamforming techniques, to improve image quality. Various beamforming methods, including Delay-and-Sum (DAS), Minimum Variance based on Feature Space, and Delay Multiply-and-Sum (DMAS), are employed and integrated with coherent compounding algorithms. Results from linear target imaging experiments demonstrate that, compared to single-element transmission, plane-wave transmission significantly enhances image contrast. Among the beamforming methods, the combination of Minimum Variance based on Feature Space and coherent compounding yields the highest resolution and contrast. Compared to the conventional DAS method, the contrast is improved by 10 dB, and both the circumferential and radial resolutions are enhanced by 0.8 mm. The imaging contrast was further enhanced by improving the calculation method of the correlation matrix. Further imaging experiments on the human upper arm validate the practical application of the proposed imaging algorithms. |
| DOI： |
| 中文关键词: 平面波成像 环形阵列 自适应波束形成 |
| 英文关键词: Plane wave imaging Circular array Adaptive beamforming |
| 基金项目:国家自然科学基金面上项目(No. 12474461) 、中国科学院声学研究所独立部署的基础前沿探索项目(No. JCQY202402) 、中国科学院声学研究所自主部署“目标导向”类项目(MBDX202113) |
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