title: Translational-circular scanning for magneto-acoustic tomography with current injection.
abstract: BACKGROUND
  Magneto-acoustic tomography with current injection involves using electrical impedance imaging technology. To explore the potential applications in imaging biological tissue and enhance image quality, a new scan mode for the transducer is proposed that is based on translational and circular scanning to record acoustic signals from sources.
  
  
  METHODS
  An imaging algorithm to analyze these signals is developed in respect to this alternative scanning scheme. Numerical simulations and physical experiments were conducted to evaluate the effectiveness of this scheme. An experiment using a graphite sheet as a tissue-mimicking phantom medium was conducted to verify simulation results. A pulsed voltage signal was applied across the sample, and acoustic signals were recorded as the transducer performed stepped translational or circular scans. The imaging algorithm was used to obtain an acoustic-source image based on the signals.
  
  
  RESULTS
  In simulations, the acoustic-source image is correlated with the conductivity at the sample boundaries of the sample, but image results change depending on distance and angular aspect of the transducer. In general, as angle and distance decreases, the image quality improves. Moreover, experimental data confirmed the correlation.
  
  
  CONCLUSIONS
  The acoustic-source images resulting from the alternative scanning mode has yielded the outline of a phantom medium. This scan mode enables improvements to be made in the sensitivity of the detecting unit and a change to a transducer array that would improve the efficiency and accuracy of acoustic-source images.
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China. fsxywsg@163.com.|College of Radiology, Taishan Medical University, Taian, 271016, China. fsxywsg@163.com.
authors.forename: Shigang
authors.initials: S
authors.lastname: Wang
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China. likesaber@gmail.com.
authors.forename: Ren
authors.initials: R
authors.lastname: Ma
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China. zhangshunqi2004@126.com.
authors.forename: Shunqi
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China. bme500@163.com.
authors.forename: Tao
authors.initials: T
authors.lastname: Yin
authors.affiliation: Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300192, China. lzpeng67@163.com.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Liu
mesh_terms: D000162:Acoustics; D000465:Algorithms; D003198:Computer Simulation; D004553:Electric Conductivity; D017097:Electric Impedance; D006108:Graphite; D007091:Image Processing, Computer-Assisted; D007267:Injections; D060328:Magnetic Phenomena; D014054:Tomography / Q000379:methods*
chemical_list: D006108:Graphite
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