Phase Modulation Beamforming for Ultrafast Plane-Wave Imaging.
Phase Modulation Beamforming for Ultrafast Plane-Wave Imaging.
复制标题
DOI：
10.1109/tuffc.2020.2993763
复制
发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Lindsey BD
中科院分区：
文献类型：
--
作者：
Jing B;Lindsey BD
为了提高高帧频成像的空间分辨率，提出了一种新的成像方法，该方法在接收数据中引入极弱的像差，然后通过取多幅像差图像的像素级标准差并从延迟求和图像中减去该结果来组合多幅结果。这种方法在模拟、组织模拟体模实验和体内成像中得到了证明。模拟结果表明，目标的横向半高宽（FWHM）降低了38.24 ± 6.38%。在7.8 MHz的仿组织体模中对导丝靶进行成像时，导丝靶FWHM降低了35.91 ± 5.39%。然而，在体模研究中观察到对比度降低了1.23 dB，CNR降低了18.5%，这是由于相似图像的相减，这增加了图像中暗像素的数量。最后，所提出的技术在体内进行测试，与图像显示类似的改进，在组织模仿幻影，包括增加之间的间隔紧密的目标。
In order to improve the spatial resolution for high frame rate imaging, a new image formation approach is proposed based on introducing very weak aberration into received data, then combining multiple results by taking the pixel-wise standard deviation of multiple aberrated images and subtracting the result from the delay-and-sum image. This approach is demonstrated in simulations, tissue-mimicking phantom experiments, and in vivo imaging. Simulations indicate the lateral full-width half-max (FWHM) of targets decreases by 38.24 ± 6.38%. In imaging wire targets in a tissue-mimicking phantom at 7.8 MHz, wire target FWHM decreases by 35.91 ± 5.39%. However, contrast was observed to decrease by 1.23 dB and CNR by 18.5% in phantom studies due to the subtraction of similar images, which increases the number of dark pixels in the image. Finally, the proposed technique is tested in vivo, with images showing improvements similar to those in tissue-mimicking phantoms, including increased separation between closely-spaced targets.