Browsing by Author "Bourqui, Jeremie"

Now showing 1 - 6 of 6
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    Antenna Evaluation for Ultra-Wideband Microwave Imaging
    (2010-05-09) Bourqui, Jeremie; Campbell, Mark A.; Williams, Trevor; Fear, Elise C.
    Numerous antenna designs have been proposed for microwave breast imaging utilizing an ultra-wideband frequency range. The antennas are typically compact, operate in an immersion medium, and have a band covering at least 2–10 GHz. We have developed 3 antennas for our UWB microwave breast imaging system. In this contribution, we compare the performance of the antennas in order to gain insight into the relationship between antenna performance metrics and image quality.
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    Antenna Evaluation for Ultra-WidebandMicrowave Imaging
    (Hindawi Publishing Corporation, 2010-02-07) Bourqui, Jeremie; Campbell, Mark A.; Williams, Trevor; Fear, Elise C.
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    Measurement and Analysis of Microwave Frequency Signals Transmitted through the Breast
    (2012-03-07) Bourqui, Jeremie; Garrett, John; Fear, Elise
    Microwave approaches to breast imaging include the measurement of signals transmitted through and reflected from the breast. Prototype systems typically feature sensors separated from the breast, resulting in measurements that include the effects of the environment and system. To gain insight into transmission of microwave signals through the breast, a system that places sensors in direct contact with the breast is proposed. The system also includes a lossy immersion medium that enables measurement of the signal passing through the breast while significantly attenuating signals traveling along other paths. Collecting measurements at different separations between sensors also provides the opportunity to estimate the average electrical properties of the breast tissues. After validation through simulations and measurements, a study of 10 volunteers was performed. Results indicate symmetry between the right and left breast and demonstrate differences in attenuation, maximum frequency for reliable measurement, and average properties that likely relate to variations in breast composition.
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    A Prototype System for Measuring Microwave Frequency Reflections from the Breast
    (Hindawi Publishing Corporation, 2012-01-16) Bourqui, Jeremie; Sill, Jeff; Fear, Elise
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    Surface Estimation for Microwave Imaging
    (MDPI, 2017-07-19) Kurrant, Douglas; Bourqui, Jeremie; Fear, Elise
    Biomedical imaging and sensing applications in many scenarios demand accurate surface estimation from a sparse set of noisy measurements. These measurements may arise from a variety of sensing modalities, including laser or electromagnetic samples of an object's surface. We describe a state-of-the-art microwave imaging prototype that has sensors to acquire both microwave and laser measurements. The approach developed to translate sparse samples of the breast surface into an accurate estimate of the region of interest is detailed. To evaluate the efficacy of the method, laser and electromagnetic samples are acquired by sensors from three realistic breast models with varying sizes and shapes. A set of metrics is developed to assist with the investigation and demonstrate that the algorithm is able to accurately estimate the shape of a realistic breast phantom when only a sparse set of data are available. Moreover, the algorithm is robust to the presence of measurement noise, and is effective when applied to measurement scans of patients acquired with the prototype.