在使用双轴驱动的单元环传感器中,高波动态聚焦使用双轴驱动
Sagid Delgado1, Laura Curiel2, Siyun Li1
1Department of Radiology, University of Calgary, Calgary, Canada.
Ultrasonics
|June 5, 2023
概括
双轴驱动的PZT环传感器动态引导超声波的焦点,显著减少焦点区域的大小,并使精确的定位. 这一进步有利于临床前的聚焦超声波应用,例如在小动物中药物输送和神经调节.
科学领域:
- 超声波技术 超声波技术 超声波技术
- 生物医学工程 生物医学工程
- 声学物理 声学物理
背景情况:
- 双轴驱动是一种创新的技术,用于使用单元形陶传感器引导超声波场.
- 环传感器由于其轴对称几何形状,非常适合双轴驾驶,可以通过两个信号操纵光束聚焦.
研究的目的:
- 为了研究双轴驱动对单元PZT环传感器的应用,以改变焦点尺寸和位置.
- 评估不同波激发 (1st,3rd和5th) 对传感器焦点特征的影响.
主要方法:
- 使用了一种具有双轴驱动能力的单元PZT环传感器 (500 kHz).
- 通过在482kHz (1st),1.362MHz (3rd) 和2.62MHz (5th) 的波激发来分析传感器的焦点特性.
- 进行模拟和实验测量,以根据驾驶信号相位和功率差异评估焦点区域的大小和位置.
主要成果:
- 双轴驾驶成功地改变了焦点的大小和位置.
- 在第一个波时,焦点面积减少了多达89% (从31.6mm2减少到3.4mm2) .
- 实现了焦点中心的动态移位,距离传感器表面的距离从3.0毫米到9.3毫米不等,取决于所使用的波.
结论:
- 双轴驱动可以精确控制PZT环式传感器的焦点特征.
- 能够动态调整焦点大小和位置的能力对于临床前的聚焦超声波应用非常有利.
- 潜在的应用包括在小型动物模型中加强药物输送和神经调节研究.
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