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首页> 外文期刊>Arabian Journal for Science and Engineering >A Low-Cost Portable Wireless Multi-frequency Electrical Impedance Tomography System
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A Low-Cost Portable Wireless Multi-frequency Electrical Impedance Tomography System

机译：低成本便携式无线多频电阻抗层析成像系统

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摘要

Electrical impedance tomography (EIT) is an approach to reconstruct electrical resistivity images of the body noninvasively. Here we present a novel wireless high-speed frequency division multiplexing and flexible switching-based EIT system with increased temporal resolution using raspberry pi. Proposed multi-frequency electrical impedance system has good performance, portable, energy and cost-efficient. Current is injected to all the electrodes simultaneously having different frequencies which increase the speed for capturing the fast change in impedances. Proposed system can reconstruct real-time 2D images for continuously monitoring applications where impedance changes rapidly. It can capture 70 frames/sec, and its power consumption is 10 mW. The system is designed for a bandwidth of 1 kHz-1 MHz, which covers most of the medical impedance investigations. Performance of the system was measured at 25 KHz by calculating parameter of blur radius (PBR) and percentage of position error (PPE). Average PBR and PPE obtained were 0.985 and 7.24%, respectively. SNR, linearity and stability were calculated after proper calibration by applying a small current of . SNR of the system is more than 70 dB. Amplitude and phase measurement repeatability were 0.7% and , respectively. CMRR of both wired and wireless systems were measured to find the effect of noise on the wireless system. Result shows that the proposed WMFEIT system has comparable performance with the reference systems and has good scope to be used for clinical imaging applications.
机译：电阻抗断层扫描（EIT）是一种无创地重建人体电阻率图像的方法。在这里，我们介绍了一种新颖的无线高速频分复用和基于软交换的EIT系统，该系统使用树莓派具有更高的时间分辨率。提出的多频电阻抗系统具有良好的性能，可移植性，能量和成本效益。电流同时注入具有不同频率的所有电极，从而提高了捕获阻抗快速变化的速度。拟议的系统可以重建实时2D图像，以连续监视阻抗快速变化的应用。它可以捕获70帧/秒，其功耗为10 mW。该系统设计用于1 kHz-1 MHz的带宽，涵盖了大多数医学阻抗研究。通过计算模糊半径（PBR）和位置误差百分比（PPE）的参数在25 KHz下测量系统的性能。获得的平均PBR和PPE分别为0.985和7.24％。经过适当的校准后，通过施加的小电流来计算SNR，线性和稳定性。系统的信噪比大于70 dB。幅度和相位测量的重复性分别为0.7％和。测量了有线和无线系统的CMRR，以发现噪声对无线系统的影响。结果表明，所提出的WMFEIT系统具有与参考系统相当的性能，并具有良好的临床成像应用范围。

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