A Micro EIT Sensor for Real-Time and Non-Destructive 3-D Cultivated Cell Imaging

• Published in: IEEE sensors journal Vol. 18; no. 13; pp. 5402 - 5412
• Main Authors: Yin, Xipeng, Wu, Hancong, Jia, Jiabin, Yang, Yunjie
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: 3-D cell imaging; Conductivity; Dilution; Electrical impedance; electrical impedance tomography; Electrical resistivity; Electrodes; Finite element method; Image reconstruction; Medical imaging; micro sensor; Rangefinding; Real time; Real-time systems; Sensors; Tomography
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2018.2834509

A micro electrical impedance tomography (EIT) sensor with radially distributed planar electrodes was designed, characterized, and experimentally validated for real-time and non-destructive 3-D cultivated cell imaging. The 12-mm cylindrical sensor was consisted of 17 circular micro electrodes, including 16 sensing electrodes and a reference electrode. The sensor's characteristics, i.e., dynamic range of measurement and sensitivity, were examined by finite element simulations and actual measurements. MCF-7 breast cancer cells were then cultivated to form the spherical aggregate and 3-D image reconstructions were performed on three solutions containing varying number and locations of cell aggregates. Furthermore, real-time imaging of cell-drug response between a MCF-7 cell aggregate and diluted Triton X-100 solution was carried out and the 3-D conductivity variation associated with this transient process was captured successfully and reconstructed in high accuracy. The simulation, 3-D cell aggregate imaging experiments and real-time reconstructions of cell-drug response suggest that the EIT-based micro sensor has the potential to study non-destructively and in real time the dynamic biological behavior of a 3-D cell culture system.