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首页> 美国卫生研究院文献>Healthcare Technology Letters >In vivo and in situ measurement and modelling of intra-body effective complex permittivity
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In vivo and in situ measurement and modelling of intra-body effective complex permittivity

机译：体内和体内有效复介电常数的测量和建模

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Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity ε in terms of refraction ε′, absorption ε″ and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of ε′ and ε′′. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors’ model. Therefore, they derived statistical-based models for ε′ and ε′′ using their experimental measurements.
机译：通常在假设人体是均匀传播介质的前提下研究微创医学中医用微型机器人的射频跟踪。在这封信中，作者进行了各种试验程序，以折光率ε'，吸收率ε''及其在胃肠道（GI）器官（即食道，胃，小肠和大肠）中的变化来测量和建模有效复介电常数ε。 ）和体内和原位条件下的猪腹壁。他们进一步研究了不规则和不同步的收缩以及腹腔内和腹壁存在时胃肠道器官的蠕动运动对ε'和ε''测量和变化的影响。他们通过估计一个分析模型来改进层间非均质介质的有效复介电常数的先前模型，该模型考虑了层之间的反射并计算了波在穿过胃肠道和腹壁时遇到的衰减。他们发现，由于胃肠道形态计量变量的非几何边界而导致偏离指定标称层厚度的问题，对作者模型的性能产生了影响。因此，他们使用实验测量结果得出了基于统计的ε'和ε''模型。

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