Use of the Magnetic  Field Generated by the Internal Distribution of Injected Currents for Electrical Impedance Tomography (MR-EIT)

Y. Ziya İder And Özlem BİRGÜL

Article Details

Use of the Magnetic Field Generated by the Internal Distribution of Injected Currents for Electrical Impedance Tomography (MR-EIT)

Authors:

Y. Ziya İder And Özlem BİRGÜL

Publisher:

TUBITAK

Journal:

Turkish Journal of Electrical Engineering and Computer Science 1998 Vol.6 Issue 3, pp.215-226

Document Type:

Article

Publication Date:

2/1998

Document Language:

Turkish

Document ID (Org No.):

2000744432

Frequency:

Bimonthly

eISSN:

1303-6203

pISSN:

1300-0632

Abstract:

 

In two dimensional conventional Electrical Impedance Tomography (EIT), volume conductor is probed by means of injected currents, and peripheral voltage measurements are used as input to the reconstruction algorithm. The current that flows in the 2D object creates magnetic fields that are perpendicular to the plane of imaging. Such magnetic fields can be measured using magnetic resonance tomography. In this study, use of this magnetic field generated by the injected currents, for the purpose of reconstructing the conductivity distribution, is studied. Sensitivity matrix relating the magnetic field to the element conductivities is calculated using the Finite Element Method and Biot-Savart law. Linearization is made during sensitivity matrix formation. This matrix is inverted using singular value decompostion. Simulations for objects placed in different parts of the imaging region are made to understand the spatial dependency of the proposed method and it is seen that the method has uniform sensitivity throughout the imaging region. Finally, images reconstructed using data taken from an experimental phantom are presented.

 

In two dimensional conventional Electrical Impedance Tomography (EIT), volume conductor is probed by means of injected currents, and peripheral voltage measurements are used as input to the reconstruction algorithm. The current that flows in the 2D object creates magnetic fields that are perpendicular to the plane of imaging. Such magnetic fields can be measured using magnetic resonance tomography. In this study, use of this magnetic field generated by the injected currents, for the purpose of reconstructing the conductivity distribution, is studied. Sensitivity matrix relating the magnetic field to the element conductivities is calculated using the Finite Element Method and Biot-Savart law. Linearization is made during sensitivity matrix formation. This matrix is inverted using singular value decompostion. Simulations for objects placed in different parts of the imaging region are made to understand the spatial dependency of the proposed method and it is seen that the method has uniform sensitivity throughout the imaging region. Finally, images reconstructed using data taken from an experimental phantom are presented.

Article Details

Use of the Magnetic Field Generated by the Internal Distribution of Injected Currents for Electrical Impedance Tomography (MR-EIT)

Authors: Y. Ziya İder And Özlem BİRGÜL

Publisher: TUBITAK

Journal: Turkish Journal of Electrical Engineering and Computer Science 1998 Vol.6 Issue 3, pp.215-226

Document Type: Article

Publication Date: 2/1998

Document Language: Turkish

Document ID (Org No.): 2000744432

Frequency: Bimonthly

eISSN: 1303-6203

pISSN: 1300-0632

Issues

Authors:

Y. Ziya İder And Özlem BİRGÜL

Publisher:

TUBITAK

Journal:

Turkish Journal of Electrical Engineering and Computer Science 1998 Vol.6 Issue 3, pp.215-226

Document Type:

Article

Publication Date:

2/1998

Document Language:

Turkish

Document ID (Org No.):

2000744432

Frequency:

Bimonthly

eISSN:

1303-6203

pISSN:

1300-0632