Solving the forward problem of magnetoacoustic tomography with magnetic induction by means of the finite element method

Li, Xun; Li, Xu; Zhu, Shanan; He, Bin

doi:10.1088/0031-9155/54/9/005

Cited by 22 publications

(18 citation statements)

References 28 publications

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“…Compared to the previous MAT-MI simulations [14], [18], [19] where an ideal ultrasound receiver is assumed, the current simulation takes into account the finite bandwidth and shape of the transducer used for imaging. These simulations, taking the transducer parameters into account, validate our experimental observations with MAT-MI where the acoustic sources at the boundaries of conductivity change alone get reconstructed.…”

Section: Discussionmentioning

confidence: 99%

B-Scan Based Acoustic Source Reconstruction for Magnetoacoustic Tomography With Magnetic Induction (MAT-MI)

Mariappan

2011

IEEE Trans. Biomed. Eng.

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We present in this study an acoustic source reconstruction method using focused transducer with B mode imaging for magnetoacoustic tomography with magnetic induction (MAT-MI). MAT-MI is an imaging modality proposed for non-invasive conductivity imaging with high spatial resolution. In MAT-MI acoustic sources are generated in a conductive object by placing it in a static and a time-varying magnetic field. The acoustic waves from these sources propagate in all directions and are collected with transducers placed around the object. The collected signal is then usedto reconstruct the acoustic source distribution and to further estimate the electrical conductivity distribution of the object. A flat piston transducer acting as a point receiver has been used in previous MAT-MI systems to collect acoustic signals. In the present study we propose to use B mode scan scheme with a focused transducer that gives a signal gain in its focus region and improves the MAT-MI signal quality. A simulation protocol that can take into account different transducer designs and scan schemes for MAT-MI imaging is developed and used in our evaluation of different MAT-MI system designs. It is shown in our computer simulations that, as compared to the previous approach, the MAT-MI system using B-scan with a focused transducer allows MAT-MI imaging at a closer distance and has improved system sensitivity. In addition, the B scan imaging technique allows reconstruction of the MAT-MI acoustic sources with a discrete number of scanning locations which greatly increases the applicability of the MAT-MI approach especially when a continuous acoustic window is not available in real clinical applications. We have also conducted phantom experiments to evaluate the proposed method and the reconstructed image shows a good agreement with the target phantom.

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Section: Discussionmentioning

confidence: 99%

B-Scan Based Acoustic Source Reconstruction for Magnetoacoustic Tomography With Magnetic Induction (MAT-MI)

Mariappan

2011

IEEE Trans. Biomed. Eng.

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“…Ultrasound waves are then sensed to reconstruct the electrical conductivity related image. Ever since the MAT-MI method was proposed, there have been many numerical studies (Li et al , 2007; Ma and He, 2007; Li et al , 2009; Zhou et al , 2011) and experimental studies using physical phantoms (Li et al , 2006; Xia et al , 2007; Sun et al , 2013) or biological tissues (Hu et al , 2011; Hu and He, 2011) demonstrating the feasibility and performance of MAT-MI. Advancement on experimental system design (Hu et al , 2010; Li and He, 2010) and image reconstruction algorithms (Li and He, 2010; Mariappan and He, 2013) has also been achieved in recent years.…”

Section: Introductionmentioning

confidence: 99%

Magnetoacoustic tomography with magnetic induction (MAT-MI) for imaging electrical conductivity of biological tissue: a tutorial review

2016

Phys. Med. Biol.

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Magnetoacoustic tomography with magnetic induction (MAT-MI) is a noninvasive imaging method developed to map electrical conductivity of biological tissue with millimeter level spatial resolution. In MAT-MI, a time-varying magnetic stimulation is applied to induce eddy current inside the conductive tissue sample. With the existence of a static magnetic field, the Lorentz force acting on the induced eddy current drives mechanical vibrations producing detectable ultrasound signals. These ultrasound signals can then be acquired to reconstruct a map related to the sample’s electrical conductivity contrast. This work reviews fundamental ideas of MAT-MI and major techniques developed in these years. First, the physical mechanisms underlying MAT-MI imaging are described including the magnetic induction and Lorentz force induced acoustic wave propagation. Second, experimental setups and various imaging strategies for MAT-MI are reviewed and compared together with the corresponding experimental results. In addition, as a recently developed reverse mode of MAT-MI, magneto-acousto-electrical tomography with magnetic induction (MAET-MI) is briefly reviewed in terms of its theory and experimental studies. Finally, we give our opinions on existing challenges and future directions for MAT-MI research. With all the reported and future technical advancement, MAT-MI has the potential to become an important noninvasive modality for electrical conductivity imaging of biological tissue.

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“…Magnetoacousitc tomography with Magnetic Induction [1][2][3][4][5][6][7][8] is a new imaging approach which was proposed by Dr. He and his co-workers.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Source Reconstructions in Limited-View Magnetoacoustic Tomography with Magnetic Induction

Zhou

Zhu

2012

2012 International Conference on Biomedical Engineering and Biotechnology

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Magnetoacoustic tomography with magnetic induction (MAT-MI) is a noninvasive electrical conductivity imaging approach which was recently introduced. In the present study, a new algorithm for the acoustic source reconstruction with using incomplete data has been proposed. Computer simulation with a 3-D model was studied to evaluate the performance of this new approach. Compared with the prrevious methods, the new approach can reconstruct the acoustic source with a 2ʌ detection angle and significantly reduce the time for reconstructing calculation.

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Solving the forward problem of magnetoacoustic tomography with magnetic induction by means of the finite element method

Cited by 22 publications

References 28 publications

B-Scan Based Acoustic Source Reconstruction for Magnetoacoustic Tomography With Magnetic Induction (MAT-MI)

B-Scan Based Acoustic Source Reconstruction for Magnetoacoustic Tomography With Magnetic Induction (MAT-MI)

Magnetoacoustic tomography with magnetic induction (MAT-MI) for imaging electrical conductivity of biological tissue: a tutorial review

Acoustic Source Reconstructions in Limited-View Magnetoacoustic Tomography with Magnetic Induction

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