Surowiec A, Stuchly S S, Keaney M, Swarup A
Phys Med Biol. 1986 Aug;31(8):901-9. doi: 10.1088/0031-9155/31/8/007.
The dielectric constant and conductivity of muscle, liver, spleen and kidney of cats in vivo and in situ immediately following the animal's death were measured at frequencies from 10 kHz to 100 MHz. A novel multi-ring capacitive sensor and a computer-controlled automatic network analyser (ANA) were employed. The results were compared with the data available from literature for the same species in the frequency range between 10 and 100 MHz. It was found that at frequencies from 10 to 100 kHz the in vitro dielectric constant for all tissues except spleen was smaller than the in vivo one. In contrast, in the range from 1 to 100 MHz the in vitro dielectric constant was larger than the in vivo one. At intermediate frequencies from 0.1 to 1 MHz both the dielectric constant in vivo and in vitro were the same within the experimental uncertainty. The dielectric constant of the spleen in vivo was quite similar to that in vitro. The in vivo conductivity of all tissues appeared to be higher than in vitro from 10 kHz to 10 MHz, while at frequencies above 10 MHz the two conductivities were within the experimental uncertainty.
在动物死后立即对猫体内和原位的肌肉、肝脏、脾脏和肾脏在10 kHz至100 MHz频率范围内的介电常数和电导率进行了测量。采用了一种新型的多环电容传感器和一台计算机控制的自动网络分析仪（ANA）。将结果与文献中该物种在10至100 MHz频率范围内的可用数据进行了比较。结果发现，在10至100 kHz频率范围内，除脾脏外的所有组织的体外介电常数均小于体内介电常数。相反，在1至100 MHz范围内，体外介电常数大于体内介电常数。在0.1至1 MHz的中间频率下，体内和体外的介电常数在实验不确定度范围内相同。脾脏的体内介电常数与体外介电常数非常相似。从10 kHz至10 MHz，所有组织的体内电导率似乎高于体外，而在高于10 MHz的频率下，两种电导率在实验不确定度范围内。
