Extending Retrospective Encoding for Robust Recovery of the Multistatic Data Set
Extending Retrospective Encoding for Robust Recovery of the Multistatic Data Set
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DOI：
10.1109/tuffc.2019.2961875
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发表时间：
2020-05-01
影响因子：
3.6
通讯作者：
Bottenus, Nick
中科院分区：
文献类型：
--
作者：
Ali, Rehman;Herickhoff, Carl D.;Bottenus, Nick
从传统超声序列中稳健地恢复多基地合成孔径数据可以实现视场中所有点的完整发射和接收聚焦，而没有虚拟源合成孔径的缺点，并进一步实现更先进的成像应用，例如反向散射相干、声速估计和相位像差校正。先前已使用基于伴随的方法在相控阵的受控发射序列上演示了多基地数据集的恢复。我们介绍两种方法来提高多基地数据集的准确性。我们首先通过应用斜坡滤波器来修改用于引导发射序列的原始技术，以补偿由基于伴随的方法引入的不均匀频率缩放。然后，我们提出了一种正则化反演技术，该技术允许附加孔径规格，并且旨在适用于引导发射和步进孔径序列。斜坡滤波伴随技术和正则化反演技术分别将受控发射序列中恢复信号与地面实况的相关性从 0.9404 提高到 0.9774 和 0.9894，将步行孔径序列中的相关性从 0.4610 提高到 0.4733 和 0.9936。
Robust recovery of multistatic synthetic aperture data from conventional ultrasound sequences can enable complete transmit-and-receive focusing at all points in the field of view without the drawbacks of virtual-source synthetic aperture and further enables more advanced imaging applications, such as backscatter coherence, sound speed estimation, and phase aberration correction. Recovery of the multistatic data set has previously been demonstrated on a steered transmit sequence for phased arrays using an adjoint-based method. We introduce two methods to improve the accuracy of the multistatic data set. We first modify the original technique used for steered transmit sequences by applying a ramp filter to compensate for the nonuniform frequency scaling introduced by the adjoint-based method. Then, we present a regularized inversion technique that allows additional aperture specification and is intended to work for both steered transmit and walking aperture sequences. The ramp-filtered adjoint and regularized inversion techniques, respectively, improve the correlation of the recovered signal with the ground truth from 0.9404 to 0.9774 and 0.9894 in steered transmit sequences and 0.4610 to 0.4733 and 0.9936 in walking aperture sequences.