Rongmin Xia

University of Minnesota Duluth, Duluth, Minnesota, United States

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Publications (5)9.7 Total impact

  • Source
    Rongmin Xia, Xu Li, Bin He
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    ABSTRACT: In this paper, we report a theoretical study on magnetoacoustic tomography with magnetic induction (MAT-MI). According to the description of signal generation mechanism using Green's function, the acoustic dipole model was proposed to describe acoustic source excited by the Lorentz force. Using Green's function, three kinds of reconstruction algorithms based on different models of acoustic source (potential energy, vectored acoustic pressure, and divergence of Lorenz force) are deduced and compared, and corresponding numerical simulations were conducted to compare these three kinds of reconstruction algorithms. The computer simulation results indicate that the potential energy method and vectored pressure method can directly reconstruct the Lorentz force distribution and give a more accurate reconstruction of electrical conductivity.
    IEEE transactions on bio-medical engineering 10/2009; 57(3):708-13. · 2.15 Impact Factor
  • Source
    Rongmin Xia, Xu Li, Bin He
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    ABSTRACT: A new theory is proposed for the reconstruction of curl-free vector field, whose divergence serves as acoustic source. The theory is applied to reconstruct vector acoustic sources from the scalar acoustic signals measured on a surface enclosing the source area. It is shown that, under certain conditions, the scalar acoustic measurements can be vectorized according to the known measurement geometry and subsequently be used to reconstruct the original vector field. Theoretically, this method extends the application domain of the existing acoustic reciprocity principle from a scalar field to a vector field, indicating that the stimulating vectorial source and the transmitted acoustic pressure vector (acoustic pressure vectorized according to certain measurement geometry) are interchangeable. Computer simulation studies were conducted to evaluate the proposed theory, and the numerical results suggest that reconstruction of a vector field using the proposed theory is not sensitive to variation in the detecting distance. The present theory may be applied to magnetoacoustic tomography with magnetic induction (MAT-MI) for reconstructing current distribution from acoustic measurements. A simulation on MAT-MI shows that, compared to existing methods, the present method can give an accurate estimation on the source current distribution and a better conductivity reconstruction.
    IEEE Transactions on Medical Imaging 06/2009; · 4.03 Impact Factor
  • Xu Li, Rongmin Xia, Bin He
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    ABSTRACT: A new tomographic algorithm for reconstructing a curl-free vector field, whose divergence serves as acoustic source is proposed. It is shown that under certain conditions, the scalar acoustic measurements obtained from a surface enclosing the source area can be vectorized according to the known measurement geometry and then be used to reconstruct the vector field. The proposed method is validated by numerical experiments. This method can be easily applied to magnetoacoustic tomography with magnetic induction (MAT-MI). A simulation study of applying this method to MAT-MI shows that compared to existing methods, the proposed method can give an accurate estimation of the induced current distribution and a better reconstruction of electrical conductivity within an object.
    Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 02/2008; 2008:5834-6.
  • Rongmin Xia, Xu Li, Bin He
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    ABSTRACT: We exploit magnetoacoustic tomography with magnetic induction (MAT-MI), which integrates magnetic induction and ultrasound measurements. We report, for the first time, the ability of MAT-MI in imaging electrical conductivity properties of biological tissue.
    Noninvasive Functional Source Imaging of the Brain and Heart and the International Conference on Functional Biomedical Imaging, 2007. NFSI-ICFBI 2007. Joint Meeting of the 6th International Symposium on; 11/2007
  • Source
    Rongmin Xia, Xu Li, Bin He
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    ABSTRACT: Magnetoacoustic tomography with magnetic induction (MAT-MI) is a recently introduced method for imaging tissue electrical impedance properties by integrating magnetic induction and ultrasound measurements. In the present study, we have developed a focused cylindrical scanning mode MAT-MI system and the corresponding reconstruction algorithms. Using this system, we demonstrated 3-dimensional MAT-MI imaging in a physical phantom, with cylindrical scanning combined with ultrasound focusing, and the ability of MAT-MI in imaging electrical conductivity properties of biological tissue.
    Applied Physics Letters 09/2007; 91(8):83903. · 3.52 Impact Factor

Publication Stats

45 Citations
9.70 Total Impact Points

Institutions

  • 2009
    • University of Minnesota Duluth
      Duluth, Minnesota, United States
  • 2007–2009
    • University of Minnesota Twin Cities
      • Department of Biomedical Engineering
      Minneapolis, MN, United States