Studying the resistivity imaging of practical phantoms with common ground current injection technique in electrical impedance tomography

Surface electrodes are essentially required to be switched by analogue multiplexers operating with a set of parallel digital data for boundary data collection in electrical impedance tomography EIT. A 16 electrode EIT system needs 16-bit parallel digital data to operate the multiplexers. More electrodes in an EIT system require more digital data bits. In this paper, a common ground current injection method is proposed for a 16 electrodes EIT system to switch the electrodes with reduced number of digital data. Common ground method needs only two 16:1 multiplexers operating with only 8-bit parallel digital data. Boundary data are collected from practical phantoms by injecting a constant current using common ground method. Resistivity images are reconstructed in EIDORS and the results are compared with the images obtained in opposite current pattern. Reconstructed images obtained with common ground method are found similar to the images obtained with the conventional opposite current pattern.

[1]  Philippe Renaud,et al.  Cell Culture Imaging Using Microimpedance Tomography , 2008, IEEE Transactions on Biomedical Engineering.

[2]  William R B Lionheart.  EIT reconstruction algorithms: pitfalls, challenges and recent developments. , 2004, Physiological measurement.

[3]  Tushar Kanti Bera,et al.  Surface electrode switching of a 16-electrode wireless EIT system using RF-based digital data transmission scheme with 8 channel encoder/decoder ICs , 2012 .

[4]  Tushar Kanti Bera,et al.  Gold electrode sensors for electrical impedance tomography (EIT) studies , 2011, 2011 IEEE Sensors Applications Symposium.

[5]  Tushar Kanti Bera,et al.  Studying the resistivity imaging of chicken tissue phantoms with different current patterns in Electrical Impedance Tomography (EIT) , 2012 .

[6]  David Isaacson,et al.  A Versatile High-Permittivity Phantom for EIT , 2008, IEEE Transactions on Biomedical Engineering.

[7]  D. Isaacson,et al.  Errors due to measuring voltage on current-carrying electrodes in electric current computed tomography , 1990, IEEE Transactions on Biomedical Engineering.

[8]  Denyer Cwl.  Electronics for real-time and three-dimensional electrical impedance tomographs. , 1996 .

[9]  L Tarassenko,et al.  Impedance imaging in the newborn. , 1987, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[10]  L M Heikkinen,et al.  A MATLAB package for the EIDORS project to reconstruct two-dimensional EIT images. , 2001, Physiological measurement.

[11]  Thomas J. Yorkey,et al.  Comparing reconstruction methods for electrical impedance tomography , 1987, Annals of Biomedical Engineering.

[12]  Raul Gonzalez Lima,et al.  Dynamic Imaging in Electrical Impedance Tomography of the Human Chest With Online Transition Matrix Identification , 2010, IEEE Transactions on Biomedical Engineering.

[13]  Tushar Kanti Bera,et al.  Improving Image Quality in Electrical Impedance Tomography (EIT) Using Projection Error Propagation-Based Regularization (PEPR) Technique: A Simulation Study , 2011 .

[14]  John E. McFee,et al.  Electrical Impedance Tomographic Imaging of Buried Landmines , 2006, IEEE Transactions on Geoscience and Remote Sensing.

[15]  T. Hope,et al.  Technology review: The use of electrical impedance scanning in the detection of breast cancer , 2003, Breast Cancer Research.

[16]  Y. L. Mo,et al.  Increasing image resolution in electrical impedance tomography , 2002 .

[17]  T. Bera,et al.  Studying the Elemental Resistivity Profile of Electrical Impedance Tomography (EIT) Images to Assess the Reconstructed Image Quality , 2011 .

[18]  Tushar Kanti Bera,et al.  A study of practical biological phantoms with simple instrumentation for Electrical Impedance Tomography (EIT) , 2009, 2009 IEEE Instrumentation and Measurement Technology Conference.

[19]  Richard H. Bayford,et al.  Electrical impedance tomography of human brain function using reconstruction algorithms based on the finite element method , 2003, NeuroImage.

[20]  Tushar Kanti Bera,et al.  Improving Conductivity Image Quality Using Block Matrix-based Multiple Regularization (BMMR) Technique in EIT: A Simulation Study , 2011 .

[21]  H Griffiths.  A phantom for electrical impedance tomography. , 1988, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[22]  David Isaacson,et al.  Dynamic electrical impedance imaging of a chest phantom using the Kalman filter , 2006, Physiological measurement.

[23]  Tushar Kanti Bera,et al.  A Chicken Tissue Phantom for Studying an Electrical Impedance Tomography (EIT) System Suitable for Clinical Imaging , 2011 .

[24]  Qing Wu,et al.  A novel combination method of electrical impedance tomography inverse problem for brain imaging , 2005 .

[25]  A. E. Hoetink,et al.  Imaging of thoracic blood volume changes during the heart cycle with electrical impedance using a linear spot-electrode array , 2002, IEEE Transactions on Medical Imaging.

[26]  A.R. Zapata-Ferrer,et al.  Electrical impedance tomography: an electronic design, with adaptive voltage measurements and a phantom circuit for research in the epilepsy field , 1997, Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136).

[27]  Tushar Kanti Bera,et al.  Resistivity imaging of a reconfigurable phantom with circular inhomogeneities in 2D-electrical impedance tomography , 2011 .

[28]  A. Formisano,et al.  Effective Exploitation of Prior Information in Electrical Impedance Tomography for Thermal Monitoring of Hyperthermia Treatments , 2009, IEEE Transactions on Magnetics.

[29]  J. Nagaraju,et al.  A multifrequency Electrical Impedance Tomography (EIT) system for biomedical imaging , 2012, 2012 International Conference on Signal Processing and Communications (SPCOM).

[30]  D C Barber,et al.  An assessment of dynamic images by applied potential tomography for monitoring pulmonary perfusion. , 1988, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[31]  Tushar Kanti Bera,et al.  Switching of a Sixteen Electrode Array for Wireless EIT System Using a RF-Based 8-Bit Digital Data Transmission Technique , 2012 .

[32]  J. Newell,et al.  Current topics in impedance imaging. , 1987, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[33]  Tushar Kanti Bera,et al.  Switching of the surface electrode array in A 16-electrode EIT system using 8-Bit parallel digital data , 2011, 2011 World Congress on Information and Communication Technologies.

[34]  H Griffiths,et al.  A Cole phantom for EIT. , 1995, Physiological measurement.

[35]  Tushar Kanti Bera,et al.  Common Ground Method of Current Injection in Electrical Impedance Tomography , 2012 .

[36]  Tushar Kanti Bera,et al.  A Simple instrumentation calibration technique for Electrical Impedance Tomography (EIT) using a 16-electrode phantom , 2009, 2009 IEEE International Conference on Automation Science and Engineering.

[37]  B H Brown,et al.  The Sheffield data collection system. , 1987, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[38]  William R B Lionheart,et al.  A Matlab toolkit for three-dimensional electrical impedance tomography: a contribution to the Electrical Impedance and Diffuse Optical Reconstruction Software project , 2002 .

[39]  G Hahn,et al.  Systematic errors of EIT systems determined by easily-scalable resistive phantoms , 2008, Physiological measurement.

[40]  Dr D. Jennings,et al.  Design of an electrical impedance tomography phantom using active elements , 2000, Medical and Biological Engineering and Computing.

[41]  Brian H. Brown,et al.  Medical impedance tomography and process impedance tomography: a brief review , 2001 .

[42]  Tushar Kanti Bera,et al.  Image Reconstruction in Electrical Impedance Tomography (EIT) with Projection Error Propagation-based Regularization (PEPR): A Practical Phantom Study , 2011, ADCONS.

[43]  Tushar Kanti Bera,et al.  A FEM-Based Forward Solver for Studying the Forward Problem of Electrical Impedance Tomography (EIT) with A Practical Biological Phantom , 2009, 2009 IEEE International Advance Computing Conference.

[44]  Richard C. Tozer,et al.  Electrical impedance tomography applied to semiconductor wafer characterization , 1996 .

[45]  Tushar Kanti Bera,et al.  Studying the Boundary Data Profile of a Practical Phantom for Medical Electrical Impedance Tomography with Different Electrode Geometries , 2009 .

[46]  R H Bayford,et al.  Bioimpedance tomography (electrical impedance tomography). , 2006, Annual review of biomedical engineering.

[47]  T. Bera,et al.  A Model Based Iterative Image Reconstruction (MoBIIR) Algorithm for Conductivity Imaging in EIT Using Simulated Boundary Data , 2011 .

[48]  Tushar Kanti Bera,et al.  Improving the image reconstruction in Electrical Impedance Tomography (EIT) with block matrix-based Multiple Regularization (BMMR): A practical phantom study , 2011, 2011 World Congress on Information and Communication Technologies.

[49]  D S Holder,et al.  Some practical biological phantoms for calibrating multifrequency electrical impedance tomography. , 1996, Physiological measurement.

[50]  David Isaacson,et al.  Electrical Impedance Tomography , 1999, SIAM Rev..