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  • Title: [Comparison of dielectric properties of normal human esophagus and esophageal cancer using an open-ended coaxial probe].
    Author: Huang Q, Lu D, Han J, Yu H, Dong W, Cai K, Yu X.
    Journal: Nan Fang Yi Ke Da Xue Xue Bao; 2021 Nov 20; 41(11):1741-1746. PubMed ID: 34916203.
    Abstract:
    OBJECTIVE: To study the difference in dielectric properties (relative permittivity and electrical conductivity) between normal human esophageal tissues and esophageal cancer tissues resected in esophageal cancer surgery for rapid identification of esophageal cancer during surgery. METHODS: An open- end coaxial probe in the frequency range of 50 MHz to 4 GHz was used for dielectric measurement of the normal tissues and tumor tissues immediately after resection in 51 esophageal cancer cases. The difference in dielectric characteristics of the tissues was analyzed in the full frequency range, and the measurement data at 6 specific frequencies (64, 128, 298, 433, 915, and 2450 MHz) were analyzed statistically. The Cole-Cole model was used for data fitting in the entire frequency band and the measured values were compared with reported values. RESULTS: In the frequency range of 50 MHz- 4 GHz, the dielectric measurement values of esophageal cancer tissues were significantly higher than those of normal esophageal tissues. At the 6 specific frequencies, the dielectric properties also differed significantly between normal esophageal tissues and esophageal cancer tissues (P < 0.01). The Cole-Cole model achieved a good fitting result of the measured data. The measured values in this study were lower than the reported values. CONCLUSION: There are significant differences in the dielectric properties between normal esophageal tissue and tumor tissue, which may provide a new theoretical basis for rapid identification of esophageal cancer during surgery. 目的: 研究食管癌手术中切除的人体正常食管组织和食管癌组织的介电特性（相对介电常数εr和电导率σ）差异，为临床食管癌手术中快速鉴别提供一种新的理论依据。 方法: 采用开端同轴探头法在50 MHz~4 GHz频率范围内，对51名食管癌患者手术切除的标本正常部分及肿瘤部分进行介电测量。在全频段分析其介电特性差异，并且对6个特定频率点（64、128、298、433、915、2450 MHz）的数据进行统计学分析，此外采用Cole-Cole模型在整个频段内对数据进行拟合并且将测量值与文献值进行对比。 结果: 在50 MHz~4 GHz频率范围内食管癌组织的介电特性值高于正常食管组织；在6个频率点正常食管组织和食管癌组织介电特性存在显著性差异（P < 0.01）；Cole-Cole模型对测量的数据有较好的拟合结果；本研究的测量值低于文献值。 结论: 正常食管组织与肿瘤组织介电特性存在显著性差异，有望为临床食管癌术中快速鉴别提供一种新的理论依据。
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