Dielectrc Polarization of Animal Lung at Radio Frequencies
Dielectrc Polarization of Animal Lung at Radio Frequencies
复制标题
射频下动物肺的介电极化
DOI：
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发表时间：
1987
影响因子：
4.6
通讯作者：
A. Swarup
中科院分区：
文献类型：
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作者：
A. Surowiec;S. Stuchly;M. Keaney;A. Swarup
在10 kHz ~ 100 MHz频率范围内，研究了充气和放气肺的介电特性。采用计算机控制的网络分析仪和多环电容传感器。结果发现，在所研究的频率范围内，放气肺的介电常数和电导率均高于充气肺。实验数据的分析使用两种方法进行：损耗正切法和曲线拟合计算机程序称为STEPIT。发现在肺的充气和放气状态的中间频带中，介电响应主要反映毛细血管红细胞的膜极化，其中可能有其他成分的贡献，例如，肺部微循环肺中毛细红细胞的介电弛豫时间与压积细胞的介电弛豫时间相似，比生理浓度下的红细胞长得多。使用STEPIT程序获得的低频下的介电参数在充气和放气肺之间显著不同。所观察到的介电数据反映了至少两个重叠的分散体：肺毛细血管红细胞和形成肺泡的细胞结构。
Dielectric properties of the inflated and deflated fceline lung in vivo were investigated at frequencies from 10 kHz to 100 MHz. A computer-controlled network analyzer and a multiring capacitive sensor were employed. It was found that in the frequency range investigated, both the dielectric constant and the conductivity of the deflated lung were higher than those of the inflated one. The analysis of the experimental data was performed using two approaches: the loss-tangent method and the curve-fitting computer program called STEPIT. It was found that in the middle band of frequencies for both inflated and deflated states of the lung, the dielectric response mainly reflects the membrane polarization of the capillary erythrocytes with possible contributions of other components, e.g., the pulmonary microphages. The dielectric relaxation time for the capillary erythrocytes in the lung is similar to that for the packed cells, which is much longer than for the erythrocytes at physiological concentrations. The dielectric parameters at low frequencies obtained using the STEPIT program differ significantly between the inflated and deflated lung. The observed dielectric data reflect at least two overlapping dispersions: of lung capillary erythrocytes and of cellular structures forming the alveoli.
影响因子：
--
作者：
K. Foster;H. Schwan
通讯作者：
K. Foster;H. Schwan
影响因子：
3.5
作者：
STOY, RD;FOSTER, KR;SCHWAN, HP
通讯作者：
SCHWAN, HP