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-  2017 

基于射频成像的乳腺组织电特性成像技术

DOI: doi:10.7507/1001-5515.201609033

Keywords: 电特性, 磁共振成像, 生物医学成像, 电导率, 介电常数

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Abstract:

基于射频成像的电特性成像(MR-EPT)技术利用磁共振(MRI)射频场对生物组织电导率和介电常数进行重建,无需注入电流即可获得高分辨率和高精度的图像。研究采用 XFDTD 软件建立了简单的乳腺组织模型,在 128 MHz 的拉莫尔频率下采用 16 通道射频线圈进行仿真实验。实验根据正问题得到的 B1+ 场的幅值和相位重构出了乳腺组织电导率和电特性分布,并对 B1+ 添加噪声研究算法的抗噪性。实验得出,电导率和介电常数的仿真结果和参照结果的平均相对误差分别为 4.71% 和 11.32%,当添加噪声后信噪比大于 30 dB 时,噪声不会对成像结果造成影响。证明了 MR-EPT 无需激励即可获得高分辨率和高精度的图像,在早期疾病诊断方面有着较高的可行性和极大的发展潜力

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