Extracting dielectric spectroscopic properties from microwave-induced thermoacoustic signals

Available data on the dielectric properties of biological tissue across a frequency range adds an extra degree of freedom of contrast besides the baseline structural information obtained by conventional imaging techniques. In this paper, we propose a new methodology to non-invasively extract the nor...

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Bibliographic Details
Published in2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) Vol. 2016; pp. 3618 - 3621
Main Authors Shiyu Liu, Hao Nan, Dolatsha, Nemat, Arbabian, Amin
Format Conference Proceeding Journal Article
LanguageEnglish
Published United States IEEE 01.08.2016
Subjects
Acoustics
Calibration
Dielectric measurement
Dielectric Spectroscopy - instrumentation
Dielectric Spectroscopy - methods
Dielectrics
Equipment Design
Frequency measurement
Humans
Image Processing, Computer-Assisted - methods
Imaging
Mechanical factors
Microwave theory and techniques
Microwaves
Phantoms, Imaging
Radio frequency
Temperature
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Summary:Available data on the dielectric properties of biological tissue across a frequency range adds an extra degree of freedom of contrast besides the baseline structural information obtained by conventional imaging techniques. In this paper, we propose a new methodology to non-invasively extract the normalized effective conductivity of samples over a large frequency range using microwave-induced thermoacoustic (TA) signals. Additionally, a calibration approach has been adopted to remove the frequency dependency of the experimental setup errors as well as the RF power variation. The linear relationship between the TA signal amplitude on the absorbed microwave power is used to extract the properties of samples. Saline phantoms with various concentration are used to mimic different tissue materials in the proof-of-concept experiment. The extracted normalized effective conductivity by the proposed method matches the theoretical calculations as well as the direct contact measurements by a dielectric probe.
ISSN:1557-170X
DOI:10.1109/EMBC.2016.7591511