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Efficient transmit beamforming in pulse-echo ultrasonic imaging

机译:脉冲回波超声成像中的高效发射波束形成

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摘要

A high performance ultrasound imaging system requires accurate control of the amplitude of the array elements, as well as of the time delays between them, both in the transmit and receive modes. In transmission, conventional array aperture windowing implies a different driving voltage for each element of the array, an expensive solution for systems with a large number of channels. In this paper, we present a simple, versatile, and inexpensive beamforming method that operates the aperture windowing in the transmit mode, simply controlling the lengths of the electric pulses driving the array elements. Computer simulations and experimental measurements are presented for different types of arrays. They confirm that the proposed beamforming technique improves the contrast resolution of the imaging system, reducing the off-axis intensity of the radiated field pattern. Moreover, the axial resolution is slightly enhanced, because the overall length of the transmitted ultrasonic pulse is reduced.
机译:高性能超声成像系统需要在发射和接收模式下精确控制阵列元件的振幅以及它们之间的时间延迟。在传输中,常规的阵列孔径开窗意味着阵列的每个元件都有不同的驱动电压,这对于具有大量通道的系统来说是昂贵的解决方案。在本文中,我们提出了一种简单,通用且廉价的波束形成方法,该方法在发射模式下操作孔径窗口,只需控制驱动阵列元件的电脉冲的长度即可。提出了针对不同类型阵列的计算机仿真和实验测量结果。他们证实,所提出的波束成形技术提高了成像系统的对比度分辨率,降低了辐射场图案的离轴强度。此外,由于减小了所发送的超声脉冲的总长度,因此轴向分辨率略微提高了。

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