Capacitance-Digital and Impedance Converter as Electrical Tomography Measurement System for Biological Tissue

    M. I. Ikhsanti[1], R. Bouzida[1], S. K. Wijaya[1], I. Muttakin[2], Rohmadi[2], W. P. Taruno[2]

    International Symposium on Biomedical Engineering (ISBE), Jakarta, 2016

    [1] Dept. Physics, F. Mathematics and Natural Science, University of Indonesia

    [2] CTECH Labs Edwar Technology

    Corresponding Author Email:


    This research aims to explore the feasibility of capacitance-digital converter and impedance converter for measurement module in electrical
    capacitance tomography (ECT) system. ECT sensor used was a cylindrical sensor having 8 electrodes. Absolute capacitance measurement
    system based on Sigma Delta Capacitance-to-Digital-Converter AD7746 has been shown to produce measurement with high resolution.
    Whereas, capacitance measurement with wide range of frequency is possible using Impedance Converter AD5933. Comparison of
    measurement accuracy by both AD7746 and AD5933 with reference of LCR meter was evaluated. Biological matters represented in water and
    oil were treated as object reconstructed into image using linear back projection (LBP) algorithm.


    capacitance-to-digital converter; impedance converter; electrical capacitance tomography; ECT; biological tissue


    International Symposium on Biomedical Engineering (ISBE), Jakarta, 2016