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Nonactive antenna compensation for fixed-array microwave imaging: Part II--Imaging results.

P M Meaney¹, K D Paulsen, J T Chang

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

IEEE Transactions on Medical Imaging

|August 27, 1999

Summary

This study introduces a nonactive antenna-compensation model to improve microwave imaging. The model enhances real-time data acquisition and image quality, especially for breast tissue imaging.

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Area of Science:

Medical imaging
Electromagnetics
Computational modeling

Background:

Model-based microwave imaging requires accurate wave propagation representation.
Manual antenna repositioning limits current systems to slow data acquisition.
Real-time data acquisition is needed for advanced microwave imaging systems.

Purpose of the Study:

To develop a real-time data acquisition system for microwave imaging.
To improve image reconstruction quality in microwave imaging.
To address data-model mismatch caused by antenna arrays in microwave imaging.

Main Methods:

Fabrication of a 32-channel network for electronic transmit/receive mode selection.
Incorporation of a nonactive antenna-compensation model into a hybrid element near field image reconstruction algorithm.

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Application of the algorithm to 2D microwave imaging of freshly excised breast tissue.

Main Results:

The nonactive antenna-compensation model restored image quality with fixed antenna-array data acquisition.
Improvements were most significant for inclusions near the antenna array.
Increased illumination frequency necessitated greater antenna compensation.
Quantitative measures showed improved inclusion shape, position, and electrical property recovery.

Conclusions:

The nonactive antenna-compensation model effectively restores image quality in microwave imaging systems with fixed antenna arrays.
This approach enables real-time data acquisition and improves the accuracy of reconstructed images.
The method shows significant applicability for breast tissue imaging using 2D microwave systems.