Implementation of Generalized Back Projection Algorithm in 3-D EIT

Electrical impedance tomography (EIT) is an imaging modality of determining imaging the interior conductivity distribution within an object. In the paper, generalized back projection algorithm (GBPA) is proposed for EIT image reconstruction. The algorithm is based on node back projection algorithm (NBPA), and extends projection range to arbitrary part of the object. To evaluate the proposed method, GBPA is first applied to image reconstruction using a simulated cylinder model. Compared with conventional back projection algorithm (BPA) and NBPA, the images reconstructed by GBPA are more accurate in terms of several metrics used in the paper. In addition, we present image reconstruction results using a 128-channel EIT system to demonstrate the performance of GBPA in real experiments.

[1]  David Barber,et al.  Three dimensional electrical impedance tomography of the human thorax , 1996, Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[3]  Guizhi Xu,et al.  Using Polynomial Curve Fitting Method to Improve Image Quality in EIT , 2006, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society.

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

[5]  D. Geselowitz.  An application of electrocardiographic lead theory to impedance plethysmography. , 1971, IEEE transactions on bio-medical engineering.

[6]  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.

[7]  William Robert Breckon.  Image reconstruction in electrical impedance tomography , 1990 .

[8]  B H Brown,et al.  Electrical impedance tomography (EIT): a review , 2003, Journal of medical engineering & technology.

[9]  N. Holmer,et al.  Electrical Impedance Tomography , 1991 .

[10]  Mingui Sun,et al.  A 128-Electrode Three Dimensional Electrical Impedance Tomography System , 2007, 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[11]  William R B Lionheart,et al.  GREIT: a unified approach to 2D linear EIT reconstruction of lung images , 2009, Physiological measurement.