一种用于提高医学超声相控子阵成像分辨率的新型自适应变迹技术。
A novel adaptive apodization to improve the resolution of phased subarray imaging in medical ultrasound.
作者信息
Sadeghi Masume, Mahloojifar Ali
机构信息
Department of Biomedical Engineering, Tarbiat Modares University, Ale-Ahmad Avenue, P.O. Box: 14115-194, Tehran, Islamic Republic of Iran.
出版信息
J Med Ultrason (2001). 2020 Jan;47(1):13-24. doi: 10.1007/s10396-019-00970-2. Epub 2019 Sep 20.
PURPOSE
Phased subarray imaging (PSA) was previously proposed to extend the receive aperture length. Using overlapped subarrays as transmitters in PSA leads to decrement of sidelobe levels of the overall beam compared to full phased array imaging (PHA). This paper proposes an adaptive compounding of subarray images in PSA to improve both the resolution and contrast compared with PHA.
METHOD
Adaptive apodization (ADAP) is defined proportional to the beamformed responses of subarrays such that the overall energy after compounding is minimized.
RESULTS
The simulation and experimental results validate the performance of applying ADAP in PSA. The full width at half maximum (FWHM) at a depth of 30 mm in the proposed PSA is about 0.2 mm, compared to a FWHM of 0.6 mm with PHA imaging. Measuring the contrast ratio index shows that the ADAP method also improves the contrast in PSA imaging at least 25% compared to PHA imaging.
CONCLUSION
Applying the proposed ADAP, besides conventional compounding in PSA imaging, leads to improvement of both the resolution and contrast compared to PHA imaging.
目的
之前有人提出采用相控子阵列成像（PSA）来延长接收孔径长度。与全相控阵成像（PHA）相比，在PSA中使用重叠子阵列作为发射器可降低整体波束的旁瓣电平。本文提出对PSA中的子阵列图像进行自适应复合，以与PHA相比提高分辨率和对比度。
方法
自适应变迹（ADAP）定义为与子阵列的波束形成响应成比例，以使复合后的总能量最小化。
结果
模拟和实验结果验证了在PSA中应用ADAP的性能。在所提出的PSA中，深度为30 mm处的半高全宽（FWHM）约为0.2 mm，而PHA成像的FWHM为0.6 mm。测量对比度指数表明，与PHA成像相比，ADAP方法还使PSA成像中的对比度提高了至少25%。
结论
与PHA成像相比，应用所提出的ADAP，除了在PSA成像中进行传统复合之外，还能提高分辨率和对比度。
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