Surface Clutter Suppression with FDTD Recovery Signal for Microwave UWB Mammography

Kazuki NORITAKE  Shouhei KIDERA  

IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.1   pp.26-29
Publication Date: 2020/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019ECS6006
Type of Manuscript: BRIEF PAPER
Category: Electromagnetic Theory
microwave ultra wide-band (UWB) mammography,  envelope method,  FDTD-based waveform correction,  

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Microwave mammography is a promising alternative to X-ray based imaging modalities, because of its small size, low cost, and cell-friendly exposure. More importantly, this modality enables the suppression of surface reflection clutter, which can be enhanced by introducing accurate surface shape estimations. However, near-field measurements can reduce the shape estimation accuracy, due to a mismatch between the reference and observed waveforms. To mitigate this problem, this study incorporates envelope-based shape estimation and finite-difference time-domain (FDTD)-based waveform correction with a fractional derivative adjustment. Numerical simulations based on realistic breast phantoms derived from magnetic resonance imaging (MRI) show that the proposed method significantly enhances the accuracy of breast surface imaging and the performance of surface clutter rejection.