Electrical Impedance Spectroscopy Tomography for Blood Flow Visualization
A. Sapkota1, M. Koishi2, D. Kikuchi2, D.N. Huu2 and M. Takei2
1 Department of Information and Computer Engineering, National Institute of Technology, Kisarazu College, Kisarazu, Chiba Japan
2 Division of Artificial Systems Science, Chiba University, Chiba, Japan
Visualization of blood in the extracorporeal circulations can promote the effective use of extracorporeal blood circulation channel like in ventricular assistance devices, heart lung machine, hemodialysis etc. In one earlier study, we developed electrical resistance tomography system for monitoring blood in a mock extracorporeal circulation channel. However, there were some limitations in the resolutions of the constructed images. Hence, in this study electrical impedance capacitance tomography system is developed for blood flow visualization in a heparin-coated tube with circular cross-section. Experiments were conducted to evaluate the developed tomography system. In the experiments at the flow rate from 0.64 to 2.6 L / min, images of blood were reconstructed at each measurement frequency. Measurement frequency was log-swept from 1kHz to 3MHz. The tomographic image reconstruction was carried out using frequency difference imaging. The present study provides a novel blood visualization method for blood state sensing in medical applications.
Keywords Blood Flow, Extracorporeal Circulation, Impedance Spectroscopy
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