全聚焦法 TFM:把每一次收发都变成一次聚焦
Post-processing of the full matrix of ultrasonic transmit-receive array data for non-destructive evaluation
Holmes, Drinkwater, Wilcox · 2005
Foundation paper · permanent
2005
相控阵只能在一个聚焦深度上清晰,能否让整幅图像处处都在焦点上?
What they did采集全矩阵捕获(FMC)数据,逐像素做虚拟源收发求和,得到全聚焦图像。
Evidence在缺陷成像对比度与分辨上明显优于常规聚焦,成为阵列超声的基线方法。
Do not over-trust算量随像素与阵元数平方增长;实时化要靠 GPU 与稀疏化,牺牲的是哪一部分要写清楚。
Limits数据量大、计算重;对声速均匀假设敏感;各向异性与厚壁衰减场景需修正。
In-class task用 64 阵元仿真数据分别做常规聚焦与 TFM,比较 Φ1 mm 孔的分辨率与耗时。
A foundation paper is the landmark work for a method and stays permanently: it explains why the method works, and is never replaced for being old.
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