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Experimental Breast Phantom Imaging with Metamaterial-Inspired Nine-Antenna Sensor Array.

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This study introduces a novel microwave imaging system for early breast tumor detection. The system utilizes improved metamaterial antennas and a delay-multiply-and-sum algorithm for accurate tumor identification.

Keywords:
breast tumorhomogenous phantommetamaterial loaded antennamicrowave imagingultrawideband antenna

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Area of Science:

  • Biomedical Engineering
  • Electromagnetics
  • Medical Imaging

Background:

  • Early breast tumor detection is crucial for effective treatment.
  • Existing screening methods have limitations in sensitivity and specificity.
  • Microwave imaging offers a promising non-ionizing radiation-based alternative.

Purpose of the Study:

  • To develop and validate an experimental microwave imaging system for early breast tumor screening.
  • To design and characterize an improved ultrawideband metamaterial antenna for enhanced signal reception.
  • To evaluate the system's capability in detecting and localizing artificial breast tumors.

Main Methods:

  • A microwave imaging system incorporating a circular array of nine improved metamaterial (MTM)-loaded ultrawideband (UWB) antenna sensors.
  • Utilized a stepper motor for array movement, an RF switching system, and MATLAB for signal processing.
  • Developed a realistic breast phantom with tumor material for system testing.
  • Employed a post-processing delay-multiply-and-sum (DMAS) algorithm for image reconstruction.

Main Results:

  • The developed UWB antenna exhibits an omnidirectional radiation pattern and a wide operating bandwidth (2.97–15 GHz).
  • The microwave imaging system successfully detected and localized artificial tumor tissues within the breast phantom.
  • The DMAS algorithm effectively processed backscattered signals to generate clear images.

Conclusions:

  • The proposed microwave imaging system demonstrates significant potential for early and accurate breast tumor detection.
  • The integration of improved MTM-loaded UWB antennas enhances the system's performance.
  • Further research can optimize the system for clinical application.