Visualizing permittivity distribution in extracorporeal circulation by ECT

抄録

Control of blood flow rate is vital in prevention of thrombogenesis in extracorporeal circulation. Electrical capacitance tomography was used to visualize permittivity distribution to enhance precision in control flow rates thrombus prevention. An ECT sensor was made to measure blood capacitance at flow rates Q from Q = 0 to 2.6 L/min using impedance analyzer at current I =1 mA and at frequency from f = 1 kHz to 3 MHz. The flow dependent cell distribution images were reconstructed based on Linear back projection while simulations and modified Hanai formula were used as a post-evaluation of methods used in main experiments. Under the images at f = 430, 550 and 758 kHz showed significant increase in permittivity with increase in Q. Results correlated well with the simulation results showing flow dependent permittivity distribution. This adds a medical dimension to application of ECT to visualize permittivity distributions in proactive prevention thrombogenesis