Open AccessInvestigation of artifacts by mapping SAR in thermoacoustic imaging
Author(s) -
Xiao Liang,
Qiang Liu,
Zezhou Sun,
Weizhi Qi,
Yubin Gong,
Lei Xi
Publication year - 2021
Publication title -
journal of innovative optical health sciences/journal of innovation in optical health science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 24
eISSN - 1793-5458
pISSN - 1793-7205
DOI - 10.1142/s1793545821500115
Subject(s) - microwave imaging , microwave , focus (optics) , feature (linguistics) , synthetic aperture radar , scattering , specific absorption rate , computer science , curvature , optics , physics , computer vision , telecommunications , linguistics , philosophy , geometry , mathematics , antenna (radio)
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.