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Implementation of swept synthetic aperture imaging

机译：扫描合成孔径成像的实施

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Ultrasound imaging of deep targets is limited by the resolution of current ultrasound systems based on the available aperture size. We propose a system to synthesize an extended effective aperture in order to improve resolution and target detectability at depth using a precisely-tracked transducer swept across the region of interest. A Field II simulation was performed to demonstrate the swept aperture approach in both the spatial and frequency domains. The adaptively beamformed system was tested experimentally using a volumetric transducer and an ex vivo canine abdominal layer to evaluate the impact of clutter-generating tissue on the resulting point spread function. Resolution was improved by 73% using a 30.8 degree sweep despite the presence of varying aberration across the array with an amplitude on the order of 100 ns. Slight variations were observed in the magnitude and position of side lobes compared to the control case, but overall image quality was not significantly degraded as compared by a simulation based on the experimental point spread function. We conclude that the swept aperture imaging system may be a valuable tool for synthesizing large effective apertures using conventional ultrasound hardware.
机译：深度靶的超声成像受基于可用孔径尺寸的电流超声系统的分辨率的限制。我们提出了一种系统来合成延长的有效孔径，以便在深入的深度使用精确跟踪的换能器穿过感兴趣区域的深度来改善分辨率和目标可检测性。执行磁场II模拟以展示空间和频率域中的扫描孔径方法。通过体积换能器和前体内犬腹层通过实验测试自适应的波束形成系统，以评估杂波产生组织对所得点扩散功能的影响。尽管存在于阵列上的幅度为100ns的幅度，但是在30.8度扫描中，使用30.8度扫描的分辨率提高了73％。与控制壳体相比，在侧瓣的幅度和位置观察到轻微变化，但是通过基于实验点扩散功能的模拟相比，整体图像质量不会显着降低。我们得出结论，扫孔成像系统可以是用于使用传统的超声硬件合成大有效孔的有价值的工具。

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