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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >S-sequence spatially-encoded synthetic aperture ultrasound imaging [Correspondence]
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S-sequence spatially-encoded synthetic aperture ultrasound imaging [Correspondence]

机译：S序列空间编码合成孔径超声成像[对应]

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摘要

Synthetic transmit aperture (STA) ultrasound imaging offers near-ideal reconstruction across an entire field of view. This performance comes at the cost of SNR compared with scanning using only dynamic receive focusing. SNR may be enhanced by using spatial encoding using a Hadamard sequence. An encoding based on a Hadamard sequence has two main drawbacks: the array must be capable of transmitting a pulse and an inverted pulse at the same time, and the inverted transmission must be symmetrical with respect to the non-inverted transmission. These are often not the case in practice, and thus Hadamard encoding may require twice as many transmission events and special consideration of the inverted waveform. As an alternative, we propose the use of Ssequences, which are similar to Hadamard sequences, but use half the elements and do not require an inverted pulse. This encoding is implemented on a commercial ultrasound system and compared with STA imaging using single-element emissions and Hadamard encoding in terms of SNR and resolution using a point target. We find that the two encodings perform very similarly despite the increased transmit power and doubling of transmit events in our implementation of Hadamard imaging. Both encodings give up to 19 dB signal improvement over single-element STA imaging, while maintaining resolution. Finally, we show sample in vivo human carotid images with all three methods which illustrate the suitability of Ssequence- encoded STA imaging for a clinical setting.
机译：合成发射孔径（STA）超声成像可在整个视场中提供近乎理想的重建。与仅使用动态接收聚焦进行扫描相比，此性能是以SNR为代价的。可以通过使用使用Hadamard序列的空间编码来增强SNR。基于Hadamard序列的编码有两个主要缺点：阵列必须能够同时传输脉冲和反相脉冲，并且反相传输必须相对于非反相传输对称。实际上，通常情况并非如此，因此Hadamard编码可能需要两倍的传输事件，并且需要特别考虑反相波形。作为替代方案，我们建议使用与Hadamard序列相似的序列，但使用元素的一半，并且不需要反向脉冲。此编码在商用超声系统上实现，并且与使用单元素发射的STA成像和使用点目标的SNR和分辨率方面的Hadamard编码进行了比较。我们发现，尽管在我们的Hadamard成像实现中，尽管增加了发射功率并且发射事件增加了一倍，但这两种编码的性能却非常相似。相对于单元素STA成像，两种编码都可提供高达19 dB的信号改善，同时保持分辨率。最后，我们用所有三种方法显示了样品中的人体颈动脉图像，这些图像说明了序列编码的STA成像在临床环境中的适用性。

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