You are viewing a javascript disabled version of the site. Please enable Javascript for this site to function properly.
Go to headerGo to navigationGo to searchGo to contentsGo to footer
In content section. Select this link to jump to navigation

Effect of the secondary process on mass point vibration velocity propagation in magneto-acoustic tomography and magneto-acousto-electrical tomography

Abstract

BACKGROUND:

As two of the new biological electrical impedance tomography (EIT), magneto-acoustic tomography (MAT) and magneto-acousto-electrical tomography (MAET) achieve both the high contrast property of EIT and the high spatial resolution property of sonography through combining EIT and sonography. As both MAT and MAET contain a uniform magnetic field, vibration and electrical current density, there is a secondary process both in MAT and in MAET, which is MAET and MAT respectively.

OBJECTIVE:

To analyze the effect of the secondary process on mass point vibration velocity (MPVV) propagation in MAT and MAET.

METHODS:

By analyzing the total force to the sample, the wave equations of MPVV in MAT and MAET - when the secondary processes were considered - were derived. The expression of the attenuation constant in the wave number was derived in the case that the mass point vibration velocity propagates in the form of cylindrical wave and plane wave. Attenuations of propagation of the MPVV in several samples were quantified.

RESULTS:

Attenuations of the MPVV after propagating for 1 mm in copper or aluminum foil, and for 5 cm in gel phantom or biological soft tissue were less than 1%.

CONCLUSION:

Attenuations of the MPVV in MAT and MAET due to the secondary processes are relatively minor, and effects of the secondary processes on MPVV propagation in MAT and MAET can be ignored.

References

[1] 

Towe BC, . Islam MR. A magneto-acoustic method for the noninvasive measurement of bioelectric currents[J]. Biomedical Engineering, IEEE Transactions on, 1988, 35(10): 892-894.

[2] 

Xu Y, . He B. Magnetoacoustic tomography with magnetic induction (MAT-MI)[J]. Physics in Medicine and Biology, 2005, 50(21): 5175.

[3] 

Liu GQ, . Huang X, . Xia H. et al. Magnetoacoustic tomography with current injection[J]. Chinese Science Bulletin, 2013, 58(30): 3600-3606.

[4] 

Wen H, . Shah J, . Balaban RS. Hall effect imaging[J]. Biomedical Engineering, IEEE Transactions on, 1998, 45(1): 119-124.

[5] 

Xu Y, . Haider S, . Hrbek A. Magneto-acousto-electrical tomography: A new imaging modality for electrical impedance[C]. 13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography. Springer Berlin Heidelberg, 2007: 292-295.

[6] 

Haider S, . Hrbek A, . Xu Y. Magneto-acousto-electrical tomography: A potential method for imaging current density and electrical impedance[J]. Physiological Measurement, 2008, 29(6): S41-50.

[7] 

Guo L, . Liu G, . Xia H. Magneto-Acousto-Electrical Tomography with Magnetic Induction for Conductivity Reconstruction[J]. IEEE Transactions on Bio-medical Engineering, 2014.

[8] 

Wang H. The algorithm of magnetoacoustic tomography with magnetic induction, Master's thesis, Graduate School of Chinese Academy of Sciences, 2008.

[9] 

Li X. A study on magnetoacoustic tomography with magnetic induction(MAT-MI) for imaging elctrical impedance of biological tissue, Ph.D.Dissertation, Zhengjiang University, 2009.

[10] 

Li X. Magnetoacoustic Tomography with Magnetic Induction for Electrical Conductivity Imaging of Biological Tissue, Ph.D. Dissertation, University of Minnesota, 2010.

[11] 

He W. A study on sound source mechanism and algorithm of magnetoacoustic tomography with mag-netic induction, Master's thesis, Graduate School of Chinese Academy of Sciences, 2011.

[12] 

Mariappan L. Magnetoacoustic tomography with magnetic induction for electrical conductivity based tissue imaging, Ph.D. Dissertation University of Minnesota, 2014.

[13] 

Zeng X. Research for Magneto-Acousto-Electrical Tomography, Master's thesis, Graduate School of Chinese Academy of Sciences, 2011.

[14] 

Zhang H. Theoretical Acoustics (Revised Edition), Higher Education Press, China, 2012, pp. 176-183.