Two-dimensional FDTD analysis of a pulsed microwave confocal system for breast cancer detection: Fixed-focus and antenna-array sensors
Two-dimensional FDTD analysis of a pulsed microwave confocal system for breast cancer detection: Fixed-focus and antenna-array sensors
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DOI：
10.1109/10.730440
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发表时间：
1998-12-01
影响因子：
4.6
通讯作者：
Bridges, JE
中科院分区：
文献类型：
--
作者：
Hagness, SC;Taflove, A;Bridges, JE
研究了一种用于检测乳腺肿瘤的新型聚焦主动微波系统。与X射线和超声模式不同，本文综述的方法利用了乳腺组织独特的微波光谱物理性质，即正常乳腺组织的半透明性质，以及恶性肿瘤与周围无病变的正常乳腺组织之间的高介电对比度。该系统使用脉冲共聚焦技术和时间门控来增强对肿瘤的检测，同时抑制组织异质性和吸收的影响。利用已发表的正常乳腺组织和恶性肿瘤的介电特性数据，我们对该系统进行了二维(2-D)时域有限差分(FDTD)计算电磁分析。FDTD模拟搁置了在存在由周围正常组织的异质性产生的背景杂波的情况下，可以稳健地检测到直径仅为2 mm的肿瘤。肿瘤位置的横向空间分辨率约为0.5 cm。
A novel focused active microwave system is investigated for detecting tumors in the breast. In contrast to X-ray and ultrasound modalities, the method reviewed here exploits the breast-tissue physical properties unique to the microwave spectrum, namely, the translucent nature of normal breast tissues and the high dielectric contrast between malignant tumors and surrounding lesion-free normal breast tissues. The system uses a pulsed confocal technique and time-gating to enhance the detection of tumors while suppressing the effects of tissue heterogeneity and absorption. Using published data for the dielectric properties of normal breast tissues and malignant tumors, we have conducted a two-dimensional (2-D) finite-difference time-domain (FDTD) computational electromagnetics analysis of the system. The FDTD simulations shelved that tumors as small as 2 mm in diameter could be robustly detected in the presence of the background clutter generated by the heterogeneity of the surrounding normal tissue. Lateral spatial resolution of the tumor location was found to be about 0.5 cm.