Recovery of the Complete Data Set From Focused Transmit Beams.
Recovery of the Complete Data Set From Focused Transmit Beams.
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DOI：
10.1109/tuffc.2017.2773495
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发表时间：
2018-01
期刊：
影响因子：
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通讯作者：
Bottenus N
中科院分区：
文献类型：
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作者：
Bottenus N
聚焦发射束是临床超声扫描的标准工具，将多个阵列元件的能量集中到成像目标。然而，在发射焦点的上方和下方，波束中的大部分能量分布在加宽的主瓣和长的离轴尾部中，而传统的波束形成方法会忽略这些能量。这项工作提出了一种将一组聚焦发射光束分解为其组成部分的方法——来自各个阵列元件的发散波。该完整数据集的恢复使得能够在视场中的所有点进行合成发射聚焦，而没有通常与虚拟源合成孔径波束形成相关的波束形状或焦深伪影。介绍了一种高效的频域线性解码实现。该方法的原理在发射场模拟和实验成像中得到了证明。在深度处，与传统的动态接收波束形成相比，电子信噪比提高了 9.6 dB，对比度提高了 8.9 dB。所提出的方法广泛适用于现有的扫描序列，并且仅需要通道数据进行处理。
The focused transmit beam is a standard tool for clinical ultrasound scanning, concentrating energy from a number of array elements toward an imaging target. However, above and below the transmit focus, much of the energy in the beam is spread in a broadened main lobe and long off-axis tails that are ignored by conventional beamforming methods. This work proposes a method to decompose a set of focused transmit beams into their constituent components – diverging waves from individual array elements. The recovery of this complete data set enables synthetic transmit focusing at all points in the field of view without beam shape or focal depth artifacts commonly associated with virtual source synthetic aperture beamforming. An efficient frequency-domain linear decoding implementation is introduced. The principles of the method are demonstrated both in transmit field simulations and experimental imaging. At depth, up to a 9.6 dB improvement in electronic signal-to-noise ratio and 8.9 dB improvement in contrast were observed in comparison to conventional dynamic receive beamforming. The proposed method is broadly applicable to existing scan sequences and requires only channel data for processing.