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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Reduction of the grating lobes of annular arrays used in focused ultrasound surgery
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Reduction of the grating lobes of annular arrays used in focused ultrasound surgery

机译：减少聚焦超声手术中使用的环形阵列的光栅波瓣

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摘要

An annular array with variable focus, used in focused ultrasound surgery, generates grating lobes responsible for undesirable lesions. It is known that the amplitude and the location of the lobes depend on both the geometry and the frequency of the transducer. A new procedure based on the use of a wide-band CW signal, i.e., a signal phase modulated by a pseudorandom code, is proposed to reduce the amplitude of these lobes. The theoretical study enables us to determine the location and the amplitude of these lobes and to simulate the effect of the transmitted signal bandwidth. In particular, a simple analytical relation gives the intensity ratio between the grating lobes and the main lobe. This equation shows that this ratio is inversely proportional to the number of rings and to the bandwidth of the transmitted signal. A system was developed and tested with two transducer arrays of 35- and 150-mm diameter, respectively. The simulations and experiments demonstrate the validity of the theoretical study and the efficacy of the proposed procedure. In conclusion, it is possible to reduce the grating lobes without geometric modification of the array by increasing the bandwidth of the transmitted signal.
机译：在聚焦超声手术中使用的具有可变焦点的环形阵列会产生导致不希望有的病变的光栅波瓣。众所周知，波瓣的幅度和位置取决于换能器的几何形状和频率。提出了一种基于宽带CW信号的使用的新程序，即由伪随机码调制的信号相位，以减小这些波瓣的幅度。理论研究使我们能够确定这些波瓣的位置和幅度，并模拟发射信号带宽的影响。特别地，简单的解析关系给出了光栅波瓣和主波瓣之间的强度比。该方程式表明，该比率与振铃数和发射信号的带宽成反比。开发了一个系统，并分别使用两个直径分别为35毫米和150毫米的换能器阵列进行了测试。仿真和实验证明了理论研究的有效性和所提出程序的有效性。总之，可以通过增加发射信号的带宽来减少光栅波瓣而无需对阵列进行几何修改。

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