在超热温度下软生物组织的温度和状态依赖的电导率
Junren Ran1, Martin Ostoja-Starzewski1,2
1Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA.
概括
这项研究引入了一种新的基于物理的软组织电导率模型,该模型可以解释热疗法期间的温度和组织损伤. 这种方法提高了模拟射频剥离和电外科手术的准确性.
科学领域:
- 生物物理学的生物物理.
- 生物材料科学 生物材料科学
- 医学物理 医学物理
背景情况:
- 目前用于热疗法的模型往往将电导率视为仅取决于温度.
- 组织损伤评估通常是在计算后进行的,这限制了实时热模型的准确性.
- 现有的模型在热处理过程中难以准确地表示复杂的组织状态变化.
研究的目的:
- 为软生物组织开发基于物理的电导率模型,该模型包括温度和状态依赖的变性.
- 将组织损伤参数直接合到热模型中,以提高射频 (RF) 剥离和电术模拟的精度.
- 为了更全面地了解热疗法下的组织行为.
主要方法:
- 利用Arrhenius类型的微分方程来建模组织变性化的化学动力学.
- 采用修改后的斯托格林方程来描述状态转换期间的电导率变化.
- 通过在128 kHz的两个加热过程中的实验数据验证了该模型.
主要成果:
- 该模型成功地捕获了加热,冷却和再加热周期期间电导率的动态变化,证明了变质的不可逆性.
- 在恒定温度下慢过程中组织变化的准确表示突出了模型的状态依赖性.
- 该模型有效地区分了不同状态和不同程度的组织损伤.
结论:
- 将状态依赖性纳入电气性质模型显著提高了变性化过程建模的准确性.
- 开发的模型可以模拟涉及重复加热或冷却的程序,克服了先前模型的局限性.
- 这种适应患者的模型可以改善机器人辅助手术的规划和控制,最大限度地减少意外组织损伤.
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