Title :
Conductivity and current density image reconstruction in MREIT using harmonic Bz algorithm and recessed electrodes
Author :
Oh, S.H. ; Lee, B.I. ; Woo, E.J. ; Lee, S.Y. ; Cho, M.H. ; Kwon, O. ; Seo, J.K. ; Baek, W.S.
Author_Institution :
Graduate Sch. of East-West Med. Sci., Kyung Hee Univ., Kyungki, South Korea
Abstract :
This paper presents cross-sectional conductivity and current density images of an inhomogeneous saline phantom. Using a 0.3 Tesla MRI scanner with its main magnetic field in the z-direction, we measured the z-component of the induced magnetic flux density Bz, due to multiple injection currents. Four recessed electrodes are used to inject six different currents without producing artifacts near the boundary of the imaging subject. We used an image reconstruction algorithm calledΔ2Bz, algorithm to reconstruct images with a spatial resolution of 82×82 pixels (0.6×0.6 mm2/pixel). The accuracy of the reconstructed image was estimated as 13.8 to 21.5% in terms of the relative L2-error over all pixels.
Keywords :
biomedical MRI; biomedical electrodes; current density; electric impedance imaging; image reconstruction; magnetic fields; magnetic flux; medical image processing; phantoms; 0.3 tesla; MREIT; cross-sectional conductivity; current density image reconstruction; harmonic Bz algorithm; image reconstruction algorithm; inhomogeneous saline phantom; magnetic field; magnetic flux density; multiple injection current; recessed electrodes; spatial resolution; Conductivity; Current density; Current measurement; Density measurement; Electrodes; Image reconstruction; Imaging phantoms; Magnetic field measurement; Magnetic resonance imaging; Pixel;
Conference_Titel :
Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Print_ISBN :
0-7803-7789-3
DOI :
10.1109/IEMBS.2003.1279418