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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrafast Phased-Array Imaging Using Sparse Orthogonal Diverging Waves
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Ultrafast Phased-Array Imaging Using Sparse Orthogonal Diverging Waves

机译：Ultrafast相控阵使用稀疏正交发散波的成像

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摘要

We present a new transmit pulse encoding scheme for ultrafast phased-array imaging called sparse orthogonal diverging wave imaging (SODWI). In SODWI, Hadamard encoding is used to selectively invert transmit pulse phases beamformed with a diverging wave delay profile. This approach has the advantage of delivering energy to a much wider field of view than conventional Hadamard-encoded multielement synthetic transmit aperture (HMSTA), making it more suitable for phased-array applications. With SODWI, we use a synthetic transmit element delay insertion (STEDI) approach which produces significant improvements in resolution, grating lobe level, and signal-to-noise ratio (SNR) over HMSTA. We also show how in SODWI a subset of the Hadamard codes can be sparsely selected to increase the imaging frame rate at the expense of image quality. SODWI is then compared with a variety of beamforming schemes for phased-array applications, including HMSTA, STEDI-HMSTA, diverging wave imaging (DWI), synthetic aperture (SA), and focused imaging. We present the results by implementing this technique on a 64-channel custom beamforming platform with a 40-MHz phased array. When a full set of codes is used, SODWI outperforms focused imaging contrast and SNR by 2.7 and 1.8 dB in addition to an 8x increase in frame rate, respectively.
机译：我们介绍了一种新的传输脉冲编码方案，用于超快相位阵列成像称为稀疏正交发散波成像（SODWI）。在SODWI中，Hadamard编码用于选择性地反转波束形成的发射脉冲相位与发散波延迟分布。该方法具有比传统的Hadamard编码的多元素合成透射孔（HMSTA）向更广泛的视野传送能量的优点，使得其更适合分阶段阵列应用。通过SODWI，我们使用合成传递元件延迟插入（STEDI）方法，其在HMSTA上产生显着改善，在分辨率，光栅叶水平和信噪比（SNR）中产生显着改善。我们还展示SODWI中的如何稀疏地选择哈马德代码的子集以增加成像帧速率以牺牲图像质量。然后将SODWI与分阶段阵列应用的各种波束形成方案进行比较，包括HMSTA，STEDI-HMSTA，发散波成像（DWI），合成孔（SA）和聚焦成像。我们通过在具有40MHz相控阵列的64通道自定义波束成形平台上实现此技术来介绍该结果。除了使用全套代码时，除了帧速率的8倍增加之外，SODWI还优于47和1.8dB的聚焦成像对比度和SNR。

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