中国物理B ›› 2015, Vol. 24 ›› Issue (1): 14302-014302.doi: 10.1088/1674-1056/24/1/014302

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Reception pattern influence on magnetoacoustic tomography with magnetic induction

孙晓冬a, 王欣a, 周雨琦a, 马青玉a b, 章东b   

  1. a Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China;
    b Laboratory of Modern Acoustics of MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2014-07-10 修回日期:2014-08-07 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:

    Project supported by the National Basic Research Program of China (Grant No. 2011CB707900), the National Natural Science Foundation of China (Grant Nos 11274176 and 11474166), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

Reception pattern influence on magnetoacoustic tomography with magnetic induction

Sun Xiao-Dong (孙晓冬)a, Wang Xin (王欣)a, Zhou Yu-Qi (周雨琦)a, Ma Qing-Yu (马青玉)a b, Zhang Dong (章东)b   

  1. a Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China;
    b Laboratory of Modern Acoustics of MOE, Institute of Acoustics, Nanjing University, Nanjing 210093, China
  • Received:2014-07-10 Revised:2014-08-07 Online:2015-01-05 Published:2015-01-05
  • Contact: Ma Qing-Yu E-mail:maqingyu@njnu.edu.cn
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2011CB707900), the National Natural Science Foundation of China (Grant Nos 11274176 and 11474166), and the Priority Academic Program Development of Jiangsu Higher Education Institutions, China.

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摘要：

Based on the acoustic radiation theory of a dipole source, the influence of the transducer reception pattern is studied for magnetoacoustic tomography with magnetic induction (MAT-MI). Numerical studies are conducted to simulate acoustic pressures, waveforms, and reconstructed images with unidirectional, omnidirectional, and strong directional transducers. With the analyses of equivalent and projection sources, the influences of the model dimension and the layer effect are qualitatively analyzed to evaluate the performance of MAT-MI. Three-dimensional simulation studies show that the strong directional transducer with a large radius can reduce the influences of equivalent sources, projection sources, and the layer effect effectively, resulting in enhanced pressure and improved image contrast, which is beneficial for boundary pressure extraction in conductivity reconstruction. The reconstructed conductivity contrast images present the conductivity boundaries as stripes with different contrasts and polarities, representing the values and directions of the conductivity changes of the scanned layer. The favorable results provide solid evidence for transducer selection and suggest potential practical applications of MAT-MI in biomedical imaging.

关键词: magnetoacoustic tomography with magnetic induction (MAT-MI), reception pattern, projection source and equivalent source, layer effects

Abstract:

Based on the acoustic radiation theory of a dipole source, the influence of the transducer reception pattern is studied for magnetoacoustic tomography with magnetic induction (MAT-MI). Numerical studies are conducted to simulate acoustic pressures, waveforms, and reconstructed images with unidirectional, omnidirectional, and strong directional transducers. With the analyses of equivalent and projection sources, the influences of the model dimension and the layer effect are qualitatively analyzed to evaluate the performance of MAT-MI. Three-dimensional simulation studies show that the strong directional transducer with a large radius can reduce the influences of equivalent sources, projection sources, and the layer effect effectively, resulting in enhanced pressure and improved image contrast, which is beneficial for boundary pressure extraction in conductivity reconstruction. The reconstructed conductivity contrast images present the conductivity boundaries as stripes with different contrasts and polarities, representing the values and directions of the conductivity changes of the scanned layer. The favorable results provide solid evidence for transducer selection and suggest potential practical applications of MAT-MI in biomedical imaging.

Key words: magnetoacoustic tomography with magnetic induction (MAT-MI), reception pattern, projection source and equivalent source, layer effects

中图分类号:  (Acoustical measurement methods in biological systems and media)

  • 43.80.Ev
72.55.+s (Magnetoacoustic effects) 73.50.Rb (Acoustoelectric and magnetoacoustic effects)