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Nonactive antenna compensation for fixed-array microwave imaging--Part I: Model development.

K D Paulsen1, P M Meaney

  • 1Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA.

IEEE Transactions on Medical Imaging
|August 27, 1999
PubMed
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This study introduces a new model to correct distortions in microwave imaging caused by inactive antenna elements. This compensation model improves data accuracy for better image reconstruction.

Area of Science:

  • Electromagnetics
  • Biomedical Imaging
  • Antenna Theory

Background:

  • Fixed-array microwave imaging systems utilize multisensor data acquisition.
  • Nonactive antenna element interactions can introduce measurement distortions, impacting image quality.

Purpose of the Study:

  • To develop a nonactive antenna compensation model for model-based near-field microwave image reconstruction.
  • To improve the accuracy of microwave imaging measurements by addressing distortions from inactive antenna elements.

Main Methods:

  • The study proposes a compensation model treating nonactive antenna elements as impedance boundary conditions on a cylindrical surface.
  • Two parameters, effective antenna radius and impedance factor, are empirically determined from measured data.
  • These parameters are incorporated into the nonactive antenna compensation model for data-model match improvements.

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Main Results:

  • The effective radius and impedance factor parameters improve fits to experimental data in homogeneous phantoms.
  • Systematic data-model match improvements are observed in heterogeneous phantoms using the compensation model.
  • The model leads to significantly higher quality image reconstructions in Part II of the study.

Conclusions:

  • The developed nonactive antenna compensation model effectively reduces distortions in microwave imaging.
  • Incorporating this model enhances the accuracy and quality of near-field microwave image reconstruction.
  • This approach is crucial for improving fixed-array microwave imaging systems operating in the 500-900 MHz frequency band.