To obtain some prior knowledge of breast cancer detection by microwave imaging, we have measured and analyzed the complex permittivity of tissues extracted from over 140 breast cancer surgeries. The relative permittiv...To obtain some prior knowledge of breast cancer detection by microwave imaging, we have measured and analyzed the complex permittivity of tissues extracted from over 140 breast cancer surgeries. The relative permittivity and conductivity of tumor at 1.6 GHz were 17.5% and 16.2% higher than those of mammary gland tissue, respectively. In invasive ductal carcinoma of scirrhous type, 8 out of 64 had higher relative permittivity and conductivity of mammary gland than those of tumor. However, when evaluated by the Debye parameter considering the frequency dependence of the tissue, it is rare that </span><i><span style="font-family:Verdana;">ε</span></i><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;"> and Δ</span><i><span style="font-family:Verdana;">ε</span></i><span style="font-family:Verdana;"> of cancer are simultaneously lower than those of mammary gland. The relative permittivity and conductivity of fibroadenoma are almost the same as those of mammary glands. The relative permittivity and conductivity of each tissue showed strong linearity. Microwave imaging requires accurate reconstruction of </span><i><span style="font-family:Verdana;">ε</span></i><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;"> and Δ</span><i><span style="font-family:Verdana;">ε</span></i><span style="font-family:Verdana;"> to distinguish cancer from normal tissue.展开更多
This study investigated the ability of microwave holography to accurately reconstruct the tissue structure of the human body. Numerical breast and head phantoms were imaged by 3D near-field holography using backscatte...This study investigated the ability of microwave holography to accurately reconstruct the tissue structure of the human body. Numerical breast and head phantoms were imaged by 3D near-field holography using backscattered waves obtained by a monostatic planar scan. Complex organizational structures have been reconstructed accurately and quickly. In addition, breasts with relatively simple histology could be reconstructed without the matching liquid.展开更多
文摘To obtain some prior knowledge of breast cancer detection by microwave imaging, we have measured and analyzed the complex permittivity of tissues extracted from over 140 breast cancer surgeries. The relative permittivity and conductivity of tumor at 1.6 GHz were 17.5% and 16.2% higher than those of mammary gland tissue, respectively. In invasive ductal carcinoma of scirrhous type, 8 out of 64 had higher relative permittivity and conductivity of mammary gland than those of tumor. However, when evaluated by the Debye parameter considering the frequency dependence of the tissue, it is rare that </span><i><span style="font-family:Verdana;">ε</span></i><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;"> and Δ</span><i><span style="font-family:Verdana;">ε</span></i><span style="font-family:Verdana;"> of cancer are simultaneously lower than those of mammary gland. The relative permittivity and conductivity of fibroadenoma are almost the same as those of mammary glands. The relative permittivity and conductivity of each tissue showed strong linearity. Microwave imaging requires accurate reconstruction of </span><i><span style="font-family:Verdana;">ε</span></i><sub><span style="font-family:Verdana;">∞</span></sub><span style="font-family:Verdana;"> and Δ</span><i><span style="font-family:Verdana;">ε</span></i><span style="font-family:Verdana;"> to distinguish cancer from normal tissue.
文摘This study investigated the ability of microwave holography to accurately reconstruct the tissue structure of the human body. Numerical breast and head phantoms were imaged by 3D near-field holography using backscattered waves obtained by a monostatic planar scan. Complex organizational structures have been reconstructed accurately and quickly. In addition, breasts with relatively simple histology could be reconstructed without the matching liquid.
