A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements-Design and Performance Estimation
A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements-Design and Performance Estimation
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DOI：
10.3390/electronics4030507
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发表时间：
2015-09-01
期刊：
影响因子：
2.9
通讯作者：
Kaufmann, Steffen
中科院分区：
文献类型：
--
作者：
Kusche, Roman;Malhotra, Ankit;Kaufmann, Steffen
电阻抗断层成像(EIT)是一种能够估计活体组织电导率分布的成像方法。本工作提出了一种基于现场可编程门阵列(FPGA)的多频率EIT系统，用于复杂的、时间分辨的生物阻抗测量。该系统能够与多达16个电流电极和16个电压电极的测量装置一起工作。励磁电流的范围约为10微安至5毫安，而用于励磁的正弦信号的频率最高可达500千赫。此外，还可以使用线性调频或矩形信号激励。此外，所描述的系统具有高达3480阻抗谱每秒(ISPS)的采样率。用基于电阻的体模和坦克体模演示了EIT系统的性能。此外，还介绍了在呼吸周期中对人体胸腔进行的第一次测量。
Electrical impedance tomography (EIT) is an imaging method that is able to estimate the electrical conductivity distribution of living tissue. This work presents a field programmable gate array (FPGA)-based multi-frequency EIT system for complex, time-resolved bioimpedance measurements. The system has the capability to work with measurement setups with up to 16 current electrodes and 16 voltage electrodes. The excitation current has a range of about 10 mu A to 5 mA, whereas the sinusoidal signal used for excitation can have a frequency of up to 500 kHz. Additionally, the usage of a chirp or rectangular signal excitation is possible. Furthermore, the described system has a sample rate of up to 3480 impedance spectra per second (ISPS). The performance of the EIT system is demonstrated with a resistor-based phantom and tank phantoms. Additionally, first measurements taken from the human thorax during a breathing cycle are presented.