论文标题
基于FPGA的宽带EIT系统，用于复杂的生物阻抗测量 - 设计和性能估计
A FPGA-Based Broadband EIT System for Complex Bioimpedance Measurements -- Design and Performance Estimation
论文作者
论文摘要
电阻抗断层扫描（EIT）是一种能够估计活组织的电导率分布的成像方法。这项工作介绍了用于复杂，时间分辨的生物阻抗测量值的基于现场的可编程门阵列（FPGA）的多频EIT系统。该系统具有与最多16个电流电极和16个电压电极的测量设置一起工作的能力。激发电流的范围约为10 $ $ a至5 mA，而用于激发的正弦信号的频率最高为500 kHz。另外，可以使用chirp或矩形信号激发。此外，所述系统的样本速率每秒最高3480个阻抗光谱（ISP）。用基于电阻器的幻影和坦克幻影证明了EIT系统的性能。此外，提出了在呼吸周期中从人胸部采取的首次测量。
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 $μ$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.
