Classification of Multi-Layer Tissue-Mimicking Dielectric Stacks From 2 to 20 GHz

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Robert Streeter;Jooeun Lee;Gabriel Santamaria Botello;Zorana Popović
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引用次数: 0

Abstract

Determination of the thickness, permittivity, and conductivity of tissue layers in the microwave region of the electromagnetic spectrum is relevant to a number of applications, such as breast-cancer imaging and non-invasive subcutaneous tissue thermometry. Many current characterization approaches are limited to one or two layers, often required to be aqueous. This paper presents simplified modeling of a stack of tissue layers as a series of complex impedance transmission lines in the 2–20 GHz decade. A near-field, broadband interrogation antenna designed for this frequency range and placed on the skin is validated with complex reflection coefficient measurements on seventeen different stacks of materials. Initial measurements are used to build a lookup table of features that are then used to classify three independent sets of follow-up measurements on the same stacks. After processing and consideration of very thin and very low loss materials, the error rates for classification are found to be between 5.9% and 14.7%. This confirms that features extracted from a simple, calibrated one-port broadband reflection coefficient measurement provide sufficient information to identify the composition of a layered stack, modeling tissue layers.
2 ~ 20ghz多层模拟组织介质堆叠的分类
在电磁波谱的微波区域中测定组织层的厚度、介电常数和电导率与许多应用有关,例如乳腺癌成像和非侵入性皮下组织测温。许多当前的表征方法仅限于一层或两层,通常要求是含水的。本文提出了一种简化的2 - 20ghz频段的组织层叠加复杂阻抗传输线模型。为该频率范围设计的近场宽带询问天线放置在皮肤上,通过对17种不同材料堆叠的复杂反射系数测量进行了验证。初始测量值用于构建特征查找表,然后用于对同一堆栈上的三组独立的后续测量值进行分类。经过对极薄极低损耗材料的处理和考虑,发现分类错误率在5.9% ~ 14.7%之间。这证实了从一个简单的、校准的单端口宽带反射系数测量中提取的特征提供了足够的信息来识别分层堆叠的组成,模拟组织层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.40%
发文量
58
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