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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Improving the Performance of a 1-D Ultrasound Transducer Array by Subdicing
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Improving the Performance of a 1-D Ultrasound Transducer Array by Subdicing

机译：通过细分提高一维超声换能器阵列的性能

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摘要

In medical ultrasound transducer design, the geometry of the individual elements is crucial since it affects the vibration mode of each element and its radiation impedance. For a fixed frequency, optimal vibration (i.e., uniform surface motion) can be achieved by designing elements with very small width-to-thickness ratios. However, for optimal radiation impedance (i.e., highest radiated power), the width should be as large as possible. This leads to a contradiction that can be solved by subdicing wide elements. To systematically examine the effect of subdicing on the performance of a 1-D ultrasound transducer array, we applied finite-element simulations. We investigated the influence of subdicing on the radiation impedance, on the time and frequency response, and on the directivity of linear arrays with variable element widths. We also studied the effect of varying the depth of the subdicing cut. The results show that, for elements having a width greater than 0.6 times the wavelength, subdicing improves the performance compared with that of nonsubdiced elements: the emitted pressure may be increased up to a factor of three, the ringing time may be reduced by up to 50%, the bandwidth increased by up to 77%, and the sidelobes reduced by up to 13 dB. Moreover, this simulation study shows that all these improvements can already be achieved by subdicing the elements to a depth of 70% of the total element thickness. Thus, subdicing can improve important transducer parameters and, therefore, help in achieving images with improved signal-to-noise ratio and improved resolution.
机译：在医学超声换能器设计中，各个元素的几何形状至关重要，因为它会影响每个元素的振动模式及其辐射阻抗。对于固定频率，可以通过设计宽度与厚度之比非常小的元件来实现最佳振动（即均匀的表面运动）。但是，为了获得最佳的辐射阻抗（即最高辐射功率），宽度应尽可能大。这导致可以通过细分宽元素来解决矛盾。为了系统地检验细分对一维超声换能器阵列性能的影响，我们应用了有限元模拟。我们研究了细分对辐射阻抗，时间和频率响应以及元素宽度可变的线性阵列的方向性的影响。我们还研究了改变切丁深度的影响。结果表明，对于宽度大于波长的0.6倍的元素，与非细分元素相比，细分可以改善性能：发射压力可以增加到三倍，振铃时间最多可以减少三倍。 50％时，带宽最多增加77％，旁瓣减少最多13 dB。此外，此仿真研究表明，通过将元素细分为元素总厚度的70％，已经可以实现所有这些改进。因此，细分可以改善重要的换能器参数，因此有助于获得具有改善的信噪比和改善的分辨率的图像。

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