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ACT5 电阻抗断层成像系统。

ACT5 Electrical Impedance Tomography System.

出版信息

IEEE Trans Biomed Eng. 2024 Jan;71(1):227-236. doi: 10.1109/TBME.2023.3295771. Epub 2023 Dec 22.

DOI:10.1109/TBME.2023.3295771
PMID:37459258
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10798853/
Abstract

OBJECTIVE

This article introduces the Adaptive Current Tomograph 5 (ACT5) Electrical Impedance Tomography (EIT) system. ACT5 is a 32 electrode applied-current multiple-source EIT system that can display real-time images of conductivity and susceptivity at 27 frames per second. The adaptive current sources in ACT5 can apply fully programmable current patterns with frequencies varying from 5 kHz to 500 kHz. The system also displays real-time ECG readings during the EIT imaging process.

METHODS

The hardware and software design and specifications are presented, including the current source design, FPGA hardware, safety features, calibration, and shunt impedance measurement.

RESULTS

Images of conductivity and susceptivity are presented from ACT5 data collected on tank phantoms and a human subject illustrating the system's ability to provide real-time images of pulsatile perfusion and ECG traces.

SIGNIFICANCE

The portability, high signal-to-noise ratio, and flexibility of applied currents over a wide range of frequencies enable this instrument to be used to obtain useful human subject data with relative clinical ease.

摘要

目的

本文介绍了自适应电流层析成像仪 5（ACT5）电阻抗断层成像（EIT）系统。ACT5 是一个 32 电极应用电流多源 EIT 系统，每秒可显示 27 帧的传导率和磁化率实时图像。ACT5 中的自适应电流源可以施加频率从 5 kHz 到 500 kHz 变化的全可编程电流模式。该系统还在 EIT 成像过程中显示实时 ECG 读数。

方法

介绍了硬件和软件设计及规格，包括电流源设计、FPGA 硬件、安全特性、校准和分流阻抗测量。

结果

从 ACT5 采集的水箱模型和人体受试者的数据中呈现了传导率和磁化率图像，说明了该系统提供搏动灌注和 ECG 轨迹实时图像的能力。

意义

该仪器具有便携性、高信噪比和宽频率范围内应用电流的灵活性，使得相对临床简便地获取有用的人体受试者数据成为可能。

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