乳腺电阻抗扫描中电极屏蔽环对检测电场边缘效应的影响  

Influence of Electrode Shielding Ring on Detection of Electric Field Edge Effect in Breast Electrical Impedance Scanning

作　　者：王威 史学涛[2] 季振宇[2] WANG Wei;SHI Xuetao;JI Zhenyu(Department of Medical Engineering,General Hospital of Central Theater Command General Hospital of the Chinese PLA,Wuhan Hubei 430070,China;Department of Medical Electronic Engineering,Faculty of Biomedical Engineering,Fourth Military Medical University,Xi’an Shaanxi 710032,China)

机构地区：[1]中国人民解放军中部战区总医院医学工程科,湖北武汉430070 [2]第四军医大学军事生物医学工程学系医学电子工程教研室,陕西西安710032

出　　处：《中国医疗设备》2020年第11期61-65,共5页China Medical Devices

基　　金：国家自然科学基金面上项目(81671846)。

摘　　要：目的研究屏蔽环对乳腺电阻抗扫描(Electrical Impedance Scanning,EIS)检测电场边缘效应的影响,为屏蔽环宽度设计提供依据和乳腺EIS临床应用提供指导。方法在EIS仿真模型基础上,分析屏蔽环的宽度对EIS检测电场边缘效应的影响规律,利用EIS物理模型,在均匀背景下、扰动目标体存在的情况下,评估屏蔽环对EIS成像结果的影响。通过对健康乳房进行初步实验,分析屏蔽环对EIS测量数据的影响。结果屏蔽环宽度小于5 mm时或与被测体接触不均匀时,电场边缘效应对EIS检测结果影响较大;屏蔽环宽度为5 mm以上且与被测体均匀接触时可显著抑制边缘效应对EIS成像的影响。结论屏蔽环宽度设计是EIS检测电极设计的一个重要因素,优化的设计可降低电场边缘效应对成像结果的影响。Objective To study the influence of guarding ring on the edge effect of electric field in electrical impedance scanning(EIS),to provide the basis for the width design of guarding ring,and to provide operation guidance for clinical application of breast EIS.Methods Based on the EIS simulation model,the influence of the width of the guarding ring on the edge effect of the electric field in EIS detection was analyzed.Furthermore,the EIS phantom model was used to evaluate the influence of guarding ring on EIS imaging results under the condition of uniform background and the existence of disturbed target.On this basis,through the preliminary experiment of healthy breast,the influence of guarding ring on EIS measurement data was analyzed.Results When the width of the guarding ring is less than 5 mm or the contact with the measured body is uneven,the edge effect of the electric field has great influence on the EIS detection results;when the width of the guarding ring is more than 5 mm and the contact with the measured body is uniform,the edge effect on EIS imaging can be significantly suppressed.Conclusion The design of guarding ring width is an important factor in EIS detection electrode design.The optimized design can reduce the influence of electric field edge effect on EIS imaging results.

关 键 词：电阻抗扫描 电极 屏蔽环 电场边缘效应 物理模型 

分 类 号：R318.6[医药卫生—生物医学工程]