Mellenthin Michelle M, Mueller Jennifer L, de Camargo Erick Dario León Bueno, de Moura Fernando Silva, Santos Talles Batista Rattis, Lima Raul Gonzalez, Hamilton Sarah J, Muller Peter A, Alsaker Melody
School of Biomedical Engineering, Colorado State University, CO 80523 USA.
Department of Mathematics and School of Biomedical Engineering and the Department of Electrical and Computer Engineering, Colorado State University, CO 80523 USA.
IEEE Trans Instrum Meas. 2019 Sep;68(9):3137-3150. doi: 10.1109/tim.2018.2874127. Epub 2018 Nov 1.
The design and performance of the ACE1 (Active Complex Electrode) electrical impedance tomography system for single-ended phasic voltage measurements is presented. The design of the hardware and calibration procedures allow for reconstruction of conductivity and permittivity images. Phase measurement is achieved with the ACE1 active electrode circuit which measures the amplitude and phase of the voltage and the applied current at the location at which current is injected into the body. An evaluation of the system performance under typical operating conditions includes details of demodulation and calibration and an in-depth look at insightful metrics, such as signal-to-noise ratio variations during a single current pattern. Static and dynamic images of conductivity and permittivity are presented from ACE1 data collected on tank phantoms and human subjects to illustrate the system's utility.
介绍了用于单端相位电压测量的ACE1（有源复合电极）电阻抗断层成像系统的设计和性能。硬件设计和校准程序可实现电导率和介电常数图像的重建。通过ACE1有源电极电路进行相位测量，该电路在电流注入人体的位置测量电压和施加电流的幅度和相位。在典型操作条件下对系统性能的评估包括解调与校准的细节，以及对诸如单个电流模式期间信噪比变化等有洞察力指标的深入研究。展示了从水箱模型和人体受试者收集的ACE1数据得到的电导率和介电常数的静态和动态图像，以说明该系统的实用性。
