Evaluating the robustness of dual apodization with cross-correlation.
Evaluating the robustness of dual apodization with cross-correlation.
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DOI：
10.1109/tuffc.2009.1038
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发表时间：
2009-02
期刊：
影响因子：
--
通讯作者：
Yen JT
中科院分区：
文献类型：
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作者：
Seo CH;Yen JT
我们最近提出了一种新的方法来抑制旁瓣和杂波在超声成像称为双切趾与互相关或DAX。然而，由于散斑的随机性质，DAX处理的图像可能会出现人为黑点。在本文中，我们提出了一种可能的解决方案，称为动态DAX，以减少这些黑点。我们还评估了动态DAX在相位畸变和噪声存在下的鲁棒性。使用5 MHz 128单元线性阵列的仿真结果使用动态DAX，畸变强度范围从25 ns RMS到45 ns RMS，相关长度为3 mm和5 mm。当模拟直径为3 mm的消声囊肿时，与标准波束形成相比，使用动态DAX的对比度噪声比（CNR）至少有100%的改善，除了在最严重的情况下。以猪皮、脂肪和肌肉层作为实验变异体。仿真和实验结果也提出了使用动态DAX在噪声的存在下。在系统信噪比（SNR）至少为15 dB的情况下，与标准波束成形相比，CNR改善超过100%。这项工作表明，动态DAX是能够可靠地提高对比度噪声比的相位畸变和噪声的存在。
We have recently presented a new method to suppress side lobes and clutter in ultrasound imaging called dual apodization with cross-correlation or DAX. However, due to the random nature of speckle, artifactual black spots may arise with DAX-processed images. In this paper, we present one possible solution, called dynamic DAX, to reduce these black spots. We also evaluate the robustness of dynamic DAX in the presence of phase aberration and noise. Simulation results using a 5 MHz 128 element linear array are presented using dynamic DAX with aberrator strengths ranging from 25 ns RMS to 45 ns RMS with correlation lengths of 3 mm and 5 mm. When simulating a 3 mm diameter anechoic cyst, at least 100 % improvement in the contrast-to-noise ratio (CNR) compared to standard beamforming is seen using dynamic DAX except in the most severe case. Layers of pig skin, fat and muscle were used as experimental aberrators. Simulation and experimental results are also presented using dynamic DAX in the presence of noise. With a system signal-to-noise ratio (SNR) of at least 15 dB, we have a CNR improvement of over 100 % compared to standard beamforming. This work shows that dynamic DAX is able to reliably improve contrast-to-noise ratio in the presence of phase aberration and noise.