Abstract
A second-generation monostatic radar system to measure microwave reflections from the human breast is presented and analyzed. The present system can measure the outline of the breast with an accuracy of ±1 mm and precisely place the microwave sensor in an adaptive matter such that microwaves are normally incident on the skin. Microwave reflections are measured between 10 MHz to 12 GHz with sensitivity of 65 to 75 dB below the input power and a total scan time of 30 min for 140 locations. The time domain reflections measured from a volunteer show fidelity above 0.98 for signals in a single scan. Finally, multiple scans of a breast phantoms demonstrate the consistency of the system in terms of recorded reflection, outline measurement, and image reconstruction.
Highlights
Microwave imaging of biological tissues currently is in development for a range of applications [1,2,3]
Patient-specific provide similar of key challenge in microwave breast imaging with a monostaticscan radarpatterns system is is the responses from thereflection skin,the which effective of signal processing the dominant reflection from skin are layer
The positioning of the microwave sensor was measured to be within ±0.1 mm and ±0.1◦ for linear and circular movements, respectively
Summary
Microwave imaging of biological tissues currently is in development for a range of applications [1,2,3]. This article reports the development of a radar imaging prototype developed to scan breast cancer patients. The University of Bristol has developed a multi-static radar system using a hemispherical array with 31 elements [5], later increased to 60 elements [6]. Their technology was further developed by the Micrima company (Micrima, UK) and currently is in clinical trials [7]. A point cloud of the outline of the breast was recorded through a laser measurement system This prototype was used in a pre-clinical study involving breast cancer patients [10].
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