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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Hybrid multi/single layer array transducers for increased signal-to-noise ratio
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Hybrid multi/single layer array transducers for increased signal-to-noise ratio

机译：混合多层/单层阵列换能器，可提高信噪比

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摘要

In medical ultrasound imaging, two-dimensional (2-D) array transducers are necessary to implement dynamic focusing in two dimensions, phase correction in two dimensions and high speed volumetric imaging. However, the small size of a 2-D array element results in a small clamped capacitance and a large electrical impedance, which decreases the transducer signal-to-noise ratio (SNR). We have previously shown that SNR is improved using transducers made from multi-layer PZT, due to their lower electrical impedance. In this work, we hypothesize that SNR is further increased using a hybrid array configuration: in the transmit mode, a 10 /spl Omega/ electronic transmitter excites a 10 /spl Omega/ multi-layer array element; in the receive mode, a single layer element drives a high impedance preamplifier located in the transducer handle. The preamplifier drives the coaxial cable connected to the ultrasound scanner. For comparison, the following control configuration was used: in the transmit mode, a 50 /spl Omega/ source excites a single layer element, and in the receive mode, a single layer element drives a coaxial cable load. For a 5/spl times/102 hybrid array operating at 7.5 MHz, maximum transmit output power was obtained with 9 PZT layers according to the KLM transmission line model. In this case, the simulated pulse-echo SNR was improved by 23.7 dB for the hybrid configuration compared to the control. With such dramatic improvement in pulse-echo SNR, low voltage transmitters can be used. These can be fabricated on integrated circuits and incorporated into the transducer handle.
机译：在医学超声成像中，需要二维（2-D）阵列换能器来实现二维动态聚焦，二维相位校正和高速体积成像。然而，二维阵列元件的小尺寸导致小钳位电容和大电阻抗，这降低了换能器的信噪比（SNR）。先前我们已经表明，使用多层PZT制成的传感器可降低SNR，因为它们的电阻抗较低。在这项工作中，我们假设使用混合阵列配置会进一步提高SNR：在发射模式下，10 / spl Omega /电子发射器会激发10 / spl Omega /多层阵列元件；在接收模式下，单层元件驱动位于换能器手柄中的高阻抗前置放大器。前置放大器驱动连接到超声扫描仪的同轴电缆。为了进行比较，使用了以下控制配置：在发送模式下，一个50 / spl Omega /源激励一个单层元件，在接收模式下，一个单层元件驱动同轴电缆负载。对于以7.5 MHz运行的5 / spl次/ 102混合阵列，根据KLM传输线模型，通过9个PZT层获得了最大发射输出功率。在这种情况下，与对照组相比，混合配置的模拟脉冲回波SNR提高了23.7 dB。随着脉冲回波SNR的显着提高，可以使用低压发送器。这些可以在集成电路上制造并结合到换能器手柄中。

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