大脑对低强度聚焦超声波的热反应在动能水平和神经元对各种刺激的反应
Saeed Charbenny1, Zhihong Huang1
1Dept. School of Physics, Engineering and Technology, University of York, York, United Kingdom.
Computers in biology and medicine
|September 18, 2025
概括
聚焦超声波 (FUS) 可以改变大脑活动. 这项研究模拟了低强度FUS期间的热变化,揭示了即使是最小的能量也会导致温度升高,影响神经调节.
科学领域:
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
- 生物医学工程 生物医学工程
背景情况:
- 超声神经调节是一种非侵入性技术,可以影响神经元活动.
- 将聚焦超声波 (FUS) 与神经生理学联系在一起的精确机制,特别是神经元动作潜力 (AP) 上的热效应,尚未完全理解.
- 在FUS暴露期间检测微妙的热变化对于治疗开发至关重要.
研究的目的:
- 开发一个模拟模型,准确检测由低强度聚焦超声波 (LIFU) 引起的热变化.
- 分析神经元模型并确定LIFU下状态转换的电压要求.
- 调查不同时间间隔和工作周期对热效应的影响.
主要方法:
- 开发了一个模拟来模拟LIFU.U.的热变化.
- 分析了神经元模型,以确定状态转换的电压值.
- 模拟运行在不同的时间间隔 (1,5,10秒) 和工作周期 (10%,90%).
- 在特定输入参数 (7 kPa,0.0017 W/cm2) 下记录了大脑热的升高.
主要成果:
- 观察到最大的脑热升高为37.009403°C,在10秒的90%工作周期下.
- 即使在低强度的作用电位水平上也检测到温度升高.
- 模拟表明热效应发生在最小的能量输入.
结论:
- 热和机械因素都在超声波诱导的神经调节中起作用.
- 在LIFU暴露期间,热效应可以在最小的能量输入下发生.
- 这些发现对优化使用超声波的非侵入性神经调节技术具有重要意义.
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