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聚焦超声采用的聚焦方式有许多种,电子聚焦是其中之一,与其它聚焦方式相比,电子聚焦技术有很多优点,然而一些相互矛盾的条件对其设计有很大影响。通过用快速算法对阵元声场、以及频率对声场的影响进行模拟,对阵列设计中的几个主要考虑方面进行了分析,提供了一般设计思路。采用伪逆矩阵算法,对变迹技术和多焦点技术进行计算机模拟,为焦域控制提供了新的思路,结果表明:将电子聚焦阵列换能器用于高强度聚焦超声治疗设备,比其它聚焦方式有更多的优越性,但实际设计中也存在一些相互矛盾的条件,设计中需要设计者仔细权衡利弊,做出合理设计方案。
There are many kinds of focusing methods focused ultrasound, electronic focusing is one of them, compared with other focusing methods, electronic focusing has many advantages, but some of the contradictory conditions have a great impact on their design. By using the fast algorithm to simulate the sound field of the array element and the influence of the frequency on the sound field, several main considerations in the design of the array are analyzed and the general design ideas are provided. The pseudo-inverse matrix algorithm was used to simulate apodization and multi-focus techniques, which provided a new idea for the control of focal region. The results show that using electron focus array transducer for high-intensity focused ultrasound treatment equipment, compared with other focusing methods There are more superiority, but there are some contradictory conditions in the actual design, designers need to carefully weigh the pros and cons, to make a reasonable design.