Investigation of artifacts by mapping SAR in thermoacoustic imaging

Microwave-induced thermoacoustic imaging (MI-TAI) remains one of the focus of attention among biomedical imaging modalities over the last decade. However, the transmission and distribution of microwave inside bio-tissues are complicated, thus result in severe artifacts. In this study, to reveal the...

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Bibliographic Details
Published in:Journal of innovative optical health science 2021-09, Vol.14 (5), p.2150011-1-2150011-10
Main Authors: Liang, Xiao, Liu, Qiang, Sun, Zezhou, Qi, Weizhi, Gong, Yubin, Xi, Lei
Format: Article
Language:English
Subjects:
imaging
Medical imaging
microwave
Mimicry
Research Article
specific absorption rate
thermoacoustic imaging
Thermoacoustics
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Summary:Microwave-induced thermoacoustic imaging (MI-TAI) remains one of the focus of attention among biomedical imaging modalities over the last decade. However, the transmission and distribution of microwave inside bio-tissues are complicated, thus result in severe artifacts. In this study, to reveal the underlying mechanisms of artifacts, we deeply investigate the distribution of specific absorption rate (SAR) inside tissue-mimicking phantoms with varied morphological features using both mathematical simulations and corresponding experiments. Our simulated results, which are confirmed by the associated experimental results, show that the SAR distribution highly depends on the geometries of the imaging targets and the polarizing features of the microwave. In addition, we propose the potential mechanisms including Mie-scattering, Fabry-Perot-feature, small curvature effect to interpret the diffraction effect in different scenarios, which may provide basic guidance to predict and distinguish the artifacts for TAI in both fundamental and clinical studies.
ISSN:1793-5458
1793-7205
DOI:10.1142/S1793545821500115