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|description.abstract||Interest in breast imaging with electromagnetic fields in the
microwave band has been mainly motivated by certain deficiencies
in current screening and diagnostic practices based on X-ray
In this thesis the feasibility of microwave radiometry as a
modality for early-stage breast cancer detection has been
investigated based on the tumor over-temperature rationale.
The goal of this work is to establish the rationale for the
application of microwave radiometry for breast cancer detection
and to provide the basis for setting-up measurements on patients.
Basing on electrical and thermal properties of breast tissue
available in the literature I developed a numerical model to
predict the radiometric output when a contacting antenna is
scanned on the breast surface. For this reason, a full 3D model
that relates radiometric data to the temperature difference
between normal and malignant breast has been developed in order to
predict the radiometric visibility of tumors.
Then, I found that the deformation by a cooled antenna pressed
against the breast lowers the distance of a subsurface tumor from
the contacted surface thus improving the tumor radiometric
visibility. I showed this result modeling breast deformation,
temperature distribution and corresponding radiometer output both
in the presence of a tumor and in its absence.
Two patch antennas have been designed to be matched to a
multilayer model of the breast. The antennas have been measured
on volunteers in a preliminary small-scale experimental study. By
estimating the antenna reflectivity I derived a requirement on
the residual temperature when non-ideal radiation balance
radiometer and antenna are considered.
Some measurements with the "Tor Vergata" radiometer are presented.
The radiometric resolution has been characterized when
a matched load immersed in a water bath is connected to the input of the radiometer. A breast phantom and a thermal anomaly
imitator for the mammary gland have been developed.
The results of phantom measurements give positive indication on
the feasibility of thermal spot detection by our radiometer.||en|
|description.tableofcontents||1.An overview of the Breast Cancer Screening and Diagnostic Technologies - 2. Microwave Radiometry: Basic Principle - 3. Detectability of Tumor by a Radiometric System - 4. Breast Tissue Compression to Improve Radiometric Visibility - 5. Theorical and Experimental Characterization of the Radiometric Antenna - 6. Microwave radiation balance radiometer characterization||en|
|subject||breast cancer detection||en|
|subject.classification||ING-INF/02 Campi elettromagnetici||en|
|title||La Radiometria a microonde per la diagnosi del tumore al seno||en|
|degree.name||Dottorato in geoinformazione||en|
|degree.discipline||Facoltà di ingegneria||en|
|degree.grantor||Università degli studi di Roma Tor Vergata||en|
|Appears in Collections:||Tesi di dottorato in ingegneria|
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