Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach
Electrical Impedance Tomography and Spectroscopy (EITS) is a noninvasive imaging technique that creates images of cross-sections "tomos" of objects by discriminating them based on their electrical impedance. This thesis investigated and successfully confirmed the use of Code Division Multiplexing (C...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Electrical Engineering
2017
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613269370339328 |
|---|---|
| access_status_str | Open Access |
| author | Tšoeu, Mohohlo Samuel |
| author2 | Inggs, Michael |
| author_browse | Inggs, Michael Tšoeu, Mohohlo Samuel |
| author_facet | Inggs, Michael Tšoeu, Mohohlo Samuel |
| author_sort | Tšoeu, Mohohlo Samuel |
| collection | Thesis |
| description | Electrical Impedance Tomography and Spectroscopy (EITS) is a noninvasive imaging technique that creates images of cross-sections "tomos" of objects by discriminating them based on their electrical impedance. This thesis investigated and successfully confirmed the use of Code Division Multiplexing (CDM) using Gold codes in Electrical Impedance Tomography and Spectroscopy. The results obtained showed 3.5% and 6.2% errors in determining the position and size of imaged anomalies respectively, with attainable imaging speed of 462 frames/second. These results are better, compared to those reported when using Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM).This new approach provides a more robust mode of EITS for fast changing dynamic systems by eliminating temporal data inconsistencies. Furthermore, it enables robust use of frequency difference imaging and spectroscopy in EITS by eliminating frequency data inconsistencies. In this method of imaging, electric current patterns are safely injected into the imaged object by a set of electrodes arranged in a single plane on the objects surface, for 2-Dimensional (2D) imaging. For 3-Dimensional (3D) imaging, more electrode planes are used on the objects surface. The injected currents result in measurable voltages on the objects surface. Such voltages are measured, and together with the input currents, and a Finite Element Model (FEM) of the object, used to reconstruct an impedance image of the cross-sectional contents of the imaged object. The reconstruction process involves the numerical solutions of the forward problem; using Finite Element solvers and the resulting ill-posed inverse problem using iterative Optimization or Computational Intelligence methods. This method has applications mainly in the Biomedical imaging and Process monitoring fields. The primary interests of the author are, in imaging and diagnosis of cancer, neonatal pneumonia and neurological disorders which are leading causes of death in Africa and world-wide. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22866 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:26.520Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22866 Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach Tšoeu, Mohohlo Samuel Inggs, Michael Electrical Engineering Electrical Impedance Tomography and Spectroscopy (EITS) is a noninvasive imaging technique that creates images of cross-sections "tomos" of objects by discriminating them based on their electrical impedance. This thesis investigated and successfully confirmed the use of Code Division Multiplexing (CDM) using Gold codes in Electrical Impedance Tomography and Spectroscopy. The results obtained showed 3.5% and 6.2% errors in determining the position and size of imaged anomalies respectively, with attainable imaging speed of 462 frames/second. These results are better, compared to those reported when using Time Division Multiplexing (TDM) and Frequency Division Multiplexing (FDM).This new approach provides a more robust mode of EITS for fast changing dynamic systems by eliminating temporal data inconsistencies. Furthermore, it enables robust use of frequency difference imaging and spectroscopy in EITS by eliminating frequency data inconsistencies. In this method of imaging, electric current patterns are safely injected into the imaged object by a set of electrodes arranged in a single plane on the objects surface, for 2-Dimensional (2D) imaging. For 3-Dimensional (3D) imaging, more electrode planes are used on the objects surface. The injected currents result in measurable voltages on the objects surface. Such voltages are measured, and together with the input currents, and a Finite Element Model (FEM) of the object, used to reconstruct an impedance image of the cross-sectional contents of the imaged object. The reconstruction process involves the numerical solutions of the forward problem; using Finite Element solvers and the resulting ill-posed inverse problem using iterative Optimization or Computational Intelligence methods. This method has applications mainly in the Biomedical imaging and Process monitoring fields. The primary interests of the author are, in imaging and diagnosis of cancer, neonatal pneumonia and neurological disorders which are leading causes of death in Africa and world-wide. 2017-01-23T07:37:24Z 2017-01-23T07:37:24Z 2016 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/22866 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Tšoeu, Mohohlo Samuel Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| thesis_degree_str | Doctoral |
| title | Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| title_full | Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| title_fullStr | Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| title_full_unstemmed | Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| title_short | Electrical Impedance Tomography/Spectroscopy (EITS): a Code Division Multiplexed (CDM) approach |
| title_sort | electrical impedance tomography spectroscopy eits a code division multiplexed cdm approach |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/22866 |
| work_keys_str_mv | AT tsoeumohohlosamuel electricalimpedancetomographyspectroscopyeitsacodedivisionmultiplexedcdmapproach |