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Clinical Imaging of Microwave Mammography
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Transmission-Type 2-Bit Programmable Metasurface for Single-Sensor and Single-Frequency Microwave Imaging.

Yun Bo Li1, Lian Lin Li2, Bai Bing Xu1

  • 1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.

Scientific Reports
|March 31, 2016
PubMed
Summary

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Researchers developed a novel programmable metasurface for single-sensor, single-frequency microwave imaging. This innovation reduces system complexity and cost by simultaneously controlling rows and columns, avoiding object dispersion issues.

Area of Science:

  • Electromagnetics
  • Materials Science
  • Imaging Technology

Background:

  • Programmable metamaterials and metasurfaces offer real-time control for electromagnetic devices.
  • Existing single-sensor imagers often require independent unit control, increasing system complexity and cost.
  • Frequency agility in single-sensor imaging can lead to object dispersion.

Purpose of the Study:

  • To propose the first transmission-type 2-bit programmable coding metasurface for single-sensor and single-frequency microwave imaging.
  • To reduce the complexity and cost of imaging systems by introducing simultaneous row and column control.
  • To avoid object dispersion by utilizing variable modulators at a single frequency.

Main Methods:

  • Designed a two-layer binary coding unit for the transmission-type 2-bit programmable metasurface.

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  • Implemented simultaneous control of rows and columns for metasurface units, transforming modulator masks.
  • Generated random codes via computer to achieve diverse transmission patterns for solving inverse-scattering problems.

    • Main Results:

    • Demonstrated a novel single-sensor, single-frequency imaging system in the microwave frequency range.
    • Validated the system's ability to support multiple modes for inverse-scattering solutions.
    • Experimental results confirmed the effectiveness of the proposed programmable metasurface imaging system.

    Conclusions:

    • The proposed randomly programmable metasurface significantly reduces imaging system complexity and cost.
    • The single-frequency approach with variable modulators effectively mitigates object dispersion.
    • This work presents a validated, novel single-sensor and single-frequency imaging system with broad potential.