使用编码激发的CMUT和PZT传感器的热分析和SNR比较
Mudabbir Tufail Bhatti1, Borislav Gueorguiev Tomov1, Søren Elmin Diederichsen2
1Center for Fast Ultrasound Imaging, Technical University of Denmark, DK-2800 Lyngby, Denmark.
Ultrasonics
|September 25, 2023
概括
容量型微机超声波传感器 (CMUT) 在编码激发 (CE) 成像方面具有热效率,性能优于传统的PZT探头. 在安全范围内,CMUT可提高图像质量和透深度.
科学领域:
- 超声波成像 超声波成像
- 生物医学工程 生物医学工程
- 材料科学是一种材料科学.
背景情况:
- 编码激发 (CE) 通过改善信号噪声比 (SNR) 来提高超声波图像质量和透深度.
- 由于传感器温度升高超过安全限值,CE的实际应用受到限制.
- 容量型微加工超声波传感器 (CMUT) 为 CE 应用提供了潜在的优势,而不是酸 (PZT) 探针.
研究的目的:
- 在使用CE时,与PZT探头相比,研究CMUT的热性能.
- 评估CMUT在国际电工委员会 (IEC) 安全温度限制内产生CE信号的有效性.
- 量化使用CE的CMUT可以实现的SNR和透深度的改进.
主要方法:
- 在IEC标准测试条件下使用简单的声信号进行CMUT和PZT探头温度升高的比较.
- 在模拟超声波采集过程中测量传感器组件温度.
- 在幻影实验中评估SNR增益和透深度的增加.
主要成果:
- 在30分钟内,CMUT探测器显示温度升高最低 (4-5°C),而PZT探测器在4kHzPRF时,在3分钟内达到27°C的安全极限.
- 在IEC温度限制范围内,CMUT实现了13-14dB的SNR增益和30mm的透深度增加.
- 在相同的条件下,PZT探测器没有显示出显著的SNR或透深度改善.
- 机械指数和强度水平在两个探头的FDA限制以下,表明温度是CE的主要限制.
结论:
- 在CE成像中,CMUT在热效率上比PZT探针更高.
- 由于其优越的热性能,CMUT是高级CE超声波应用的有希望的候选者.
- 温度是实现超声波成像中CE的关键限制因素.
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