Electric impedance imaging is a method of
reconstructing spatial distribution of electrical conductivity inside a
subject. In this paper, a new method of electrical impedance imaging
using eddy current is proposed. The eddy current distribution in the
body depends on the conductivity distribution and the magnetic field
pattern. By changing the position of magnetic core, a set of voltage
differences is measured with a pair of electrodes. This set of voltage
differences is used in image reconstruction of conductivity
distribution. The least square error minimization method is used as a
reconstruction algorithm. The back projection algorithm is used to
get two dimensional images. Based on this principle, a measurement
system is developed and some model experiments were performed
with a saline filled phantom. The shape of each model in the
reconstructed image is similar to the corresponding model,
respectively. From the results of these experiments, it is confirmed
that the proposed method is applicable in the realization of electrical
imaging.
[1] J G Webster, "Electrical Impedance Tomography", Adam Hilger, 1990.
[2] T J Yorkey, J G Webster, and W J Tompkins, "Comparing
Reconstruction Algorithms for Electrical Impedance Tomography",
IEEE trans. Biomed. Eng., vol. BME-34, No. 11, pp. 843-852, 1987.
[3] C Belward, T Howes, and L K Forbes, "An Analytic Simplification for
the Reconstruction Problem of Electrical Impedance Tomography", Int.
Journal of Imaging Systems and Tech., vol. 12, pp. 9-15, 2002.
[4] N G Gencer, M Kuzuoglu, and Y Z Ider, "Electrical Impedance
Tomography Using Induced Currents" IEEE trans. Med. Imag., vol 13
no. 2, pp. 338-350, 1994.
[5] R Merwa and H Scharfetter, "Magnetic Induction Tomography:
evaluation of the point spread function and analysis of resolution and
image distortion", Physiol. Meas., Vol.28, pp. S313-S324, 2007.
[6] H Griffiths, "Magnetic Induction Tomography", Meas. Sci. Techno., Vol.
12, pp.1126-1131,2001.
[7] H Scharfetter, K Hollaus, J R Ferrer, and R merwa, "Single-Step 3-D
Image Reconstruction in Magnetic Induction Tomography: Theoretical
Limits of Spatial Resolution and Contrast to Noise Ratio, Ann. Biomed.
Eng. Vol. 34, No. 11, pp. 1786-1798, 2006.
[8] H Scharfetter, R Casanas, and J Rosell, "Biological Tissue
Characterization by Magnetic Induction Spectroscopy (MIS):
Requirements and Limitations", IEEE trans. Biomed. Eng., vol. 50, No.
7, pp. 870-880, 2003.
[9] R merwa, K Hollaus, P Bunner, and H Scharfetter, "Solution of inverse
problem of magnetic induction tomography (MIT), ", Physiol. Meas.,
Vol.26, pp. S241-S250, 2005.
[10] A Ambia, S Toda, T Takemae, Y Kosugi and M Hongo "New Method
of Electric Impedance Imaging Using Eddy Current with Tetrapolar
Method", IEEE trans.Biomed., submitted for publication.
[11] T Takemae, Y Kosugi, H Saito, J Ikebe, S Okubo, and M Hongo, "New
Tetrapolar Circuit Method Using Magnetic Field for Measurement of
Local Impedance Change in Biological Substances", IEEE trans.
Biomed. Eng., vol. 37, No. 1, pp. 53-59, 1990.
[12] H Kinoshita, "Basic Research of EIT using eddy current", MSc Thesis,
Shizuoka University, Japan, 2004.
[1] J G Webster, "Electrical Impedance Tomography", Adam Hilger, 1990.
[2] T J Yorkey, J G Webster, and W J Tompkins, "Comparing
Reconstruction Algorithms for Electrical Impedance Tomography",
IEEE trans. Biomed. Eng., vol. BME-34, No. 11, pp. 843-852, 1987.
[3] C Belward, T Howes, and L K Forbes, "An Analytic Simplification for
the Reconstruction Problem of Electrical Impedance Tomography", Int.
Journal of Imaging Systems and Tech., vol. 12, pp. 9-15, 2002.
[4] N G Gencer, M Kuzuoglu, and Y Z Ider, "Electrical Impedance
Tomography Using Induced Currents" IEEE trans. Med. Imag., vol 13
no. 2, pp. 338-350, 1994.
[5] R Merwa and H Scharfetter, "Magnetic Induction Tomography:
evaluation of the point spread function and analysis of resolution and
image distortion", Physiol. Meas., Vol.28, pp. S313-S324, 2007.
[6] H Griffiths, "Magnetic Induction Tomography", Meas. Sci. Techno., Vol.
12, pp.1126-1131,2001.
[7] H Scharfetter, K Hollaus, J R Ferrer, and R merwa, "Single-Step 3-D
Image Reconstruction in Magnetic Induction Tomography: Theoretical
Limits of Spatial Resolution and Contrast to Noise Ratio, Ann. Biomed.
Eng. Vol. 34, No. 11, pp. 1786-1798, 2006.
[8] H Scharfetter, R Casanas, and J Rosell, "Biological Tissue
Characterization by Magnetic Induction Spectroscopy (MIS):
Requirements and Limitations", IEEE trans. Biomed. Eng., vol. 50, No.
7, pp. 870-880, 2003.
[9] R merwa, K Hollaus, P Bunner, and H Scharfetter, "Solution of inverse
problem of magnetic induction tomography (MIT), ", Physiol. Meas.,
Vol.26, pp. S241-S250, 2005.
[10] A Ambia, S Toda, T Takemae, Y Kosugi and M Hongo "New Method
of Electric Impedance Imaging Using Eddy Current with Tetrapolar
Method", IEEE trans.Biomed., submitted for publication.
[11] T Takemae, Y Kosugi, H Saito, J Ikebe, S Okubo, and M Hongo, "New
Tetrapolar Circuit Method Using Magnetic Field for Measurement of
Local Impedance Change in Biological Substances", IEEE trans.
Biomed. Eng., vol. 37, No. 1, pp. 53-59, 1990.
[12] H Kinoshita, "Basic Research of EIT using eddy current", MSc Thesis,
Shizuoka University, Japan, 2004.
@article{"International Journal of Electrical, Electronic and Communication Sciences:61760", author = "A. Ambia and T. Takemae and Y. Kosugi and M. Hongo", title = "Electrical Impedance Imaging Using Eddy Current", abstract = "Electric impedance imaging is a method of
reconstructing spatial distribution of electrical conductivity inside a
subject. In this paper, a new method of electrical impedance imaging
using eddy current is proposed. The eddy current distribution in the
body depends on the conductivity distribution and the magnetic field
pattern. By changing the position of magnetic core, a set of voltage
differences is measured with a pair of electrodes. This set of voltage
differences is used in image reconstruction of conductivity
distribution. The least square error minimization method is used as a
reconstruction algorithm. The back projection algorithm is used to
get two dimensional images. Based on this principle, a measurement
system is developed and some model experiments were performed
with a saline filled phantom. The shape of each model in the
reconstructed image is similar to the corresponding model,
respectively. From the results of these experiments, it is confirmed
that the proposed method is applicable in the realization of electrical
imaging.", keywords = "Back projection algorithm, electrical impedancetomography, eddy current, magnetic inductance tomography.", volume = "2", number = "4", pages = "684-4", }