Li L, Kruger R A
Department of Radiology, School of Medicine, University of Utah, Salt Lake City 84132.
Phys Med Biol. 1988 Dec;33(12):1443-52. doi: 10.1088/0031-9155/33/12/009.
An electrodeless measuring technique for determining the conductivity of biological tissues at radio frequencies is described. The technique is based on measuring magnetic power dissipation in a conducting sample using a tuned circuit when the sample is immersed in a time-varying magnetic field. Theory regarding the measurements is presented. Consideration for coil design is given. Coil construction and measurement techniques are described in detail. The technique has three advantages: errors resulting from electrode lead inductance are completely removed; contacts between tissue surfaces and electrode surfaces are not needed; and maintaining water content and concentration of pH solution inside the tissues during measurements becomes easily facilitated. With the technique, conductivity values of dog kidney at room temperature were obtained in good agreement with previous work.
本文描述了一种用于测定生物组织在射频下电导率的无电极测量技术。该技术基于当样品浸入时变磁场中时，使用调谐电路测量导电样品中的磁功率耗散。文中给出了关于测量的理论。对线圈设计进行了考量。详细描述了线圈结构和测量技术。该技术具有三个优点：完全消除了电极引线电感引起的误差；无需组织表面与电极表面之间的接触；并且在测量过程中便于维持组织内部的含水量和pH溶液浓度。使用该技术，获得了室温下犬肾的电导率值，与先前的工作结果吻合良好。
