基于相干系数自适应加权的全聚焦成像与试验验证
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上海航天精密机械研究所,上海 201600

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TG115.28+5

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中国航天科技集团有限公司第八研究院产学研合作基金项目(SAST2021-061)


Total Focusing Method and Experimental Verification Based on Adaptive Weighting of Coherence Factor
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Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600

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    摘要:

    全聚焦成像是当下阵列超声成像算法的研究热点之一,但因其成像机理,原始信号的噪声和过程扰动会影响其最终的成像质量。对此,本文将医学超声成像领域已成熟应用的基于相干系数的自适应加权方法与工业超声领域的全聚焦成像算法相结合,得到TFM-CF(全聚焦-相干系数)算法,并利用相控阵标准试块开展检测成像验证试验,采用量化指标评价TFM-CF与原TFM算法。结果表明:TFM-CF处理下的分辨力和对比度均优于原算法,对于不等深横孔,分辨力指标FWHM平均提升了20 μm,对比度CR平均提高了2.71 dB,在不等距横孔试验中,分辨力指标FWHM平均提升41 μm,对比度平均提高5.26 dB,证明了基于相干系数的自适应加权方法可有效提升全聚焦成像质量。

    Abstract:

    TFM is one of the current research hotspots in array ultrasound imaging algorithms,the noise and disturbance of the original signal will affect its final imaging quality.In this regard,this paper combined the CF-based adaptive weighting method,which was applied maturely in the field of medical ultrasound imaging,with the full focus full matrix imaging algorithm in the field of industrial ultrasound imaging,proposed the TFM-CF algorithm,and conducted detection imaging verification experiments using phased array standard test blocks.In the meantime,it used quantitative indicators to evaluate the TFM-CF and the original TFM algorithms.The result shows that the resolution and contrast under TFM-CF processing are better than the original algorithm.For non-uniform depth transverse holes,the average improvement in lateral resolution is that of 20 μm,and the average improvement in contrast CR is 2.71 dB.In the test of non-uniform cross transverse holes,the average improvement in longitudinal resolution is 41 μm,and the average improvement in contrast is 5.26 dB.The adaptive weighting method based on CF can effectively improve the imaging quality of TFM can be proved.

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张家豪,黄瑶,郑雪鹏,颜江涛,危荃.基于相干系数自适应加权的全聚焦成像与试验验证[J].宇航材料工艺,2026,56(2):17-21.

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  • 收稿日期:2024-01-02
  • 最后修改日期:2026-03-27
  • 录用日期:2024-02-18
  • 在线发布日期: 2026-05-07
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