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M-sequence-coded excitation for magneto-acoustic imaging.

Shunqi Zhang1, Ren Ma1, Tao Yin1

  • 1Institute of Biomedical Engineering, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, China.

Medical & Biological Engineering & Computing
|December 21, 2018
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Summary

Magneto-acoustic imaging uses M-sequence-coded excitation to significantly boost signal-to-noise ratio (SNR) for better tissue electrical characteristic imaging. This novel approach enhances tumor diagnosis and bioelectrical current monitoring while reducing imaging time.

Keywords:
M-sequence codeMagneto-acoustic imagingPulse compressionSignal-to-noise ratio (SNR)

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Signal Processing

Background:

  • Magneto-acoustic imaging offers functional insights into tissue electrical characteristics, crucial for early tumor detection and bioelectrical current monitoring.
  • Conventional single short-pulse excitation in magneto-acoustic imaging suffers from limited signal-to-noise ratio (SNR) due to short pulse duration and low power.

Purpose of the Study:

  • To enhance the SNR of magneto-acoustic imaging by developing and validating an M-sequence-coded excitation and pulse compression technique.
  • To assess the effectiveness of M-sequence-coded excitation in improving SNR and reducing imaging time compared to traditional methods.

Main Methods:

  • Simulations were conducted to analyze magneto-acoustic signal behavior under various M-sequence-coded excitation bit lengths.
  • Experiments utilized pork and graphite slice samples to validate the proposed coded excitation method, investigating SNR and sidelobe levels.

Main Results:

  • M-sequence-coded excitations (7 to 127 bits) resulted in significant SNR improvements ranging from 17.4 dB to 40.1 dB.
  • The proposed method achieved similar SNR improvements with imaging times reduced to as low as 9.4% of that required for single pulse excitation.
  • Clear imaging of sample boundaries was achieved with coded excitations, demonstrating improved image quality.

Conclusions:

  • M-sequence-coded excitation is a highly effective strategy for substantially improving magneto-acoustic signal SNR.
  • This advanced technique enables faster and more precise magneto-acoustic imaging, with significant implications for diagnostic applications.