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A female volunteer is scanned daily using a system to measure bulk permittivity of the breast. The measured data are then compared to the volunteer's menstrual cycle. A permittivity increase of about 10% is found during the luteal phase compared to the follicular phase of the cycle. This correlates with breast density increase reported with X-ray mammography during the luteal phase.
Previously, we reported a system to estimate the average permittivity from measurements of signals transmitted through the breast. Preliminary results measured from healthy volunteers are presented and discussed. Stable permittivity values are found for multiple scans of the same volunteer, while differences between left and right breasts are usually less than 10%. In the case of a volunteer with...
Dielectric permittivity maps are created using a previously reported transmission measurement system, as well as a commercially available multi-sensor array. Comparison of the average properties and the property distribution in dielectric slabs and breast models indicate that increased accuracy and information about spatial distribution is obtained with the multi-sensor array.
Safety assessment of ultra-wideband (UWB) microwave breast imaging (MBI) techniques is examined in this contribution. Specifically, two different approaches have been applied to evaluate the specific energy absorption (SA) produced by UWB antennas inside realistic breast models. The adopted power levels and pulse repetition periods of the tissue sensing adaptive radar (TSAR) system have been considered...
A new ultrawideband sensor for breast microwave imaging is presented in this paper. The design consists of a tapered slot antenna loaded with dielectric and fed by a transverse microstrip balun. The sensor is designed to come into contact with the breast skin and to be independent to electrical property variation of the immersion medium. Simulation shows that it can keep good performance across 1...
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