| Radiation theory comparison for magnetoacoustic tomography with magnetic induction （MAT-MI） |
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| 引用本文： | Xiaodong Sun,;Yuqi Zhou,;Qingyu Ma,;Dong Zhang. Radiation theory comparison for magnetoacoustic tomography with magnetic induction （MAT-MI）[J]. 科学通报(英文版), 2014, 59(26): 3246-3254. DOI: 10.1007/s11434-014-0478-0 |
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| 作者姓名： | Xiaodong Sun, Yuqi Zhou, Qingyu Ma, Dong Zhang |
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| 作者单位： | [1]Key Laboratory of Optoelectronics of Jiangsu Province, Schoolof Physics Science and Technology, Nanjing Normal University,Nanjing 210023, China; [2]Laboratory of Modern Acoustics of MOE, Institute of Acoustics,Nanjing University, Nanjing 210093, China |
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| 基金项目： | This work was supported in part by the National Basic Research Program （2011CB707900） from Ministry of Science and Technology of China, and the National Natural Science Foun- dation of China （11274176）. The authors would like to thank Dr. Juan Tu （Institute of Acoustics, Nanjing University, China） and Prof. Bin He （Department of Biomedical Engineering, University of Minnsota, USA） for their assistance in the research on MAT-MI. |
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| 摘 要： | Based on the principle of Lorentz force induced acoustic vibration, radiation theory comparison between acoustic point and dipole sources was conducted for magnetoacoustic tomography with magnetic induction （MAT-MI）. It is proved that each acoustic source of MAT- MI is produced by the divergence of the magnetically induced Lorentz force, and the detected acoustic pressure is the integral of all diffraction sources inside the object. Wave clusters are produced by abrupt pressure changes at conductivity boundaries, and only the configurations in terms of shape and size of phantom models can be recon- structed. However, different from point source, positive and negative pressures are generated by the radiation pat- tern of dipole sources. Reverse vibration phases of wave clusters in collected waveforms and opposite polarities of borderline stripes in reconstructed images are produced at conductivity boundaries, representing the direction of conductivity changes. The experimentally collected wave- forms and reconstructed images of the aluminum foil cylinder and cylindrical saline gel phantom model agree well with simulated results. The favorable results prove the validity of the radiation theory of acoustic dipole source and provide basis for further investigation of conductivity reconstruction for MAT-MI.
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| 关 键 词： | 磁感应强度 辐射理论 声成像 偶极声源 洛伦兹力 重建图像 压力变化 电导率 |
Radiation theory comparison for magnetoacoustic tomography with magnetic induction (MAT-MI) |
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| Xiaodong Sun,Yuqi Zhou,Qingyu Ma,Dong Zhang. Radiation theory comparison for magnetoacoustic tomography with magnetic induction (MAT-MI)[J]. Chinese science bulletin, 2014, 59(26): 3246-3254. DOI: 10.1007/s11434-014-0478-0 |
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| Authors: | Xiaodong Sun Yuqi Zhou Qingyu Ma Dong Zhang |
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| Affiliation: | 1. Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics Science and Technology, Nanjing Normal University, Nanjing, 210023, China
2. Laboratory of Modern Acoustics of MOE, Institute of Acoustics, Nanjing University, Nanjing, 210093, China
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| Abstract: | Based on the principle of Lorentz force induced acoustic vibration, radiation theory comparison between acoustic point and dipole sources was conducted for magnetoacoustic tomography with magnetic induction (MAT-MI). It is proved that each acoustic source of MAT-MI is produced by the divergence of the magnetically induced Lorentz force, and the detected acoustic pressure is the integral of all diffraction sources inside the object. Wave clusters are produced by abrupt pressure changes at conductivity boundaries, and only the configurations in terms of shape and size of phantom models can be reconstructed. However, different from point source, positive and negative pressures are generated by the radiation pattern of dipole sources. Reverse vibration phases of wave clusters in collected waveforms and opposite polarities of borderline stripes in reconstructed images are produced at conductivity boundaries, representing the direction of conductivity changes. The experimentally collected waveforms and reconstructed images of the aluminum foil cylinder and cylindrical saline gel phantom model agree well with simulated results. The favorable results prove the validity of the radiation theory of acoustic dipole source and provide basis for further investigation of conductivity reconstruction for MAT-MI. |
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| Keywords: | Acoustic point and dipole sources Radiation pattern Pressure polarity Vibration phaseBorderline stripe |
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