ANALYSES OF ELECTROMAGNETIC FIELDS INDUCED IN BIOLOGICAL TISSUES BY THERMOGRAPHIC STUDIES ON EQUIVALENT PHANTOM MODELS
ANALYSES OF ELECTROMAGNETIC FIELDS INDUCED IN BIOLOGICAL TISSUES BY THERMOGRAPHIC STUDIES ON EQUIVALENT PHANTOM MODELS
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DOI：
10.1109/tmtt.1968.1127484
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发表时间：
1971-01-01
影响因子：
4.3
通讯作者：
GUY, AW
中科院分区：
文献类型：
--
作者：
GUY, AW
在研究电磁场与生物系统和组织的相互作用时，最令人烦恼的问题之一是附近源在组织中诱导的场的量化。本文介绍了一种快速评估这些领域的任意形状和特征的组织时，他们暴露于各种来源，包括平面波，孔径，槽，和偶极子源。该方法，有效的远区和近区字段，涉及到使用一个热像摄像机记录的组织结构的幻影模型中的能量吸收产生的温度distributions。然后可以在模型上的任何地方获得电场的大小，作为计算的加热模式的大小的平方根的函数。体模由介电和几何特性与其所代表的组织结构相同的材料组成。该技术的有效性进行了验证，通过比较的实验方法的结果与理论结果的情况下，平面层的组织暴露于一个矩形孔径源和圆柱形层的组织暴露于一个平面波源。作者已成功地将这一技术用于改进微波辐射器。
One of the most vexing problems in studies involving the interaction of electromagnetic fields and living biological systems and tissues is the quantification of the fields induced in the tissues by nearby sources. This paper describes a method for rapid evaluation of these fields in tissues of arbitrary shape and characteristics when they are exposed to various sources including plane wave, aperture, slot, and dipole sources. The method, valid for both far- and near-zone fields, involves the use of a thermograph camera for recording temperature disitributions produced by energy absorption in phantom models of the tissue structures. The magnitude of the electric field may then be obtained anywhere on the model as a function of the square root of the magnitude of the calculated heating pattern. The phantoms are composed of materials with dielectric and geometric properties identical to the tissue structures which they represent. The validity of the technique is verified by comparing the results of the experimental approach with the theoretical results obtained for the case of plane layers of tissue exposed to a rectangular aperture source and cylindrical layers of tissue exposed to a plane-wave source. This technique has been used successfully by the author for improving microwave applicators.