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Design of Microwave Imaging System Based on Software-Defined Radio for Medical Applications

Razavipoor, Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55391 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Shishegar, Amir Ahmad
  7. Abstract:
  8. Microwave imaging has been introduced as a substitute to previous diagnostic medical devices due to its sufficiency, portability and nondestructive radiations. Studies over the feasibility of embedding Microwave imaging in medical application has been done by VNAs which are considered as large and expensive devices; therefore, these studies are in fact not addressing the goal we are thriving for regarding low cost and portability characteristics of sought for devices. This document introduces a novel medical imaging device which can be sufficiently designed in low cost and indeed portable. It consists of 8 monopole antennas located in a circular configuration with radius 15.5 centimeters which are floated inside a water solution with 80 % glycerin content. Matching medium is used to provide impedance matching in real applications and to limit reflections outside the reservoir boundaries. The designed system uses software define radio (LimeSDR) as an alternative to the Vector Network Analyzer device and is built image by measuring 28 S parameters. To perform the proposed SDR-based imaging system for medical imaging, experiments were performed using eight monopole antennas and a switching matrix(2×8). By applying the image reconstruction algorithm, the results for a cylindrical object inside a matching medium have been reconstructed. The proposed system successfully illustrates small objects in different locations.
  9. Keywords:
  10. Microwave Imaging ; Software Defined Radio (SDR) ; Inverse Scattering ; Network Analyzer ; Medical Imaging ; Switching Matrix

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