北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (11): 2331-2337.doi: 10.13700/j.bh.1001-5965.2017.0048

• 成像测量 • 上一篇    下一篇

多激励频率模式的磁感应层析成像系统

王野, 谭超, 董峰   

  1. 天津大学 电气自动化与信息工程学院 天津市过程检测与控制重点实验室, 天津 300072
  • 收稿日期:2017-02-03 修回日期:2017-03-06 出版日期:2017-11-20 发布日期:2017-05-10
  • 通讯作者: 谭超 E-mail:tanchao@tju.edu.cn
  • 作者简介:王野,男,硕士研究生。主要研究方向:磁感应层析成像;谭超,男,博士,副教授。主要研究方向:多相流过程参数检测、过程层析成像;董峰,男,博士,教授。主要研究方向:多相流过程参数检测、过程层析成像。
  • 基金资助:
    国家自然科学基金(61571321,6151101270);天津市科技创新平台建设计划(16PTSYJC00060)

Magnetic induction tomography system with multi-excitation frequency mode

WANG Ye, TAN Chao, DONG Feng   

  1. Tianjin Key Laboratory of Process Measurement and Control, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
  • Received:2017-02-03 Revised:2017-03-06 Online:2017-11-20 Published:2017-05-10
  • Supported by:
    National Natural Science Foundation of China (61571321, 6151101270); Science and Technology Innovation Plan of Tianjin (16PTSYJC00060)

摘要: 磁感应层析成像(MIT)技术在生物医学检查与诊断中有很好的应用前景。为了实现MIT对生物组织特性信息的获取,设计了具有多激励频率模式的磁感应层析成像系统。系统采用电压激励与测量的工作模式,可选择100 kHz~4 MHz范围内的单频、扫频和混频3种激励频率模式。系统包括激励源模块、传感器线圈阵列、数据采集和调理模块、数字解调模块,采用现场可编程门阵列(FPGA)控制多路复用器、程控放大器、模拟数字转换器等。经模拟实验测试,多激励频率模式系统所获得的测试数据具有较好的一致性,信噪比在46 dB以上,不同激励频率下采集的电压差数据可用于实现被测介质电导率分布的图像重建。

关键词: 磁感应层析成像, 生物组织, 系统设计, 激励模式, 激励频率

Abstract: Magnetic induction tomography (MIT) has promising applications in biomedical examination and diagnosis. In order to acquire biological tissue characteristic information, a magnetic induction tomography system with multi-excitation frequency mode is designed. The system operates under voltage excitation and voltage measurement mode, and it can select three excitation frequency modes of single frequency, sweep frequency and mixed frequency from 100 kHz to 4 MHz. The system includes excitation source module, sensor coil array, data acquisition and conditioning module,and digital demodulation module, and it uses field-programmable gate array(FPGA) to control multiplexer, programmable amplifier, analog-digital converter and so on. The simulation experiments show that the test data acquired by the system with multi-excitation frequency mode has good consistency, its signal to noise ratio is above 46 dB, and voltage difference acquired at different excitation frequencies can be used to realize the image reconstruction of measured object conductivity distribution.

Key words: magnetic induction tomography, biological tissue, system design, excitation mode, excitation frequency

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