基于射频成像的乳腺组织电特性成像技术
发布时间：2018-07-17 16:36
【摘要】：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 d B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。
[Abstract]:The electrical characteristic imaging (MR-EPT) technology based on radio frequency imaging (MRI) is used to reconstruct the electrical conductivity and permittivity of biological tissues by magnetic resonance (MRI). The high resolution and high precision images can be obtained without injection of current. A simple breast fabric model is established by using XFDTD software, and a 16 pass is used under the Larmor frequency of 128 MHz. Simulation experiments were carried out on the radio frequency coil. The distribution of electrical conductivity and electrical properties of the breast tissue was reconstructed according to the amplitude and phase of the B1+ field obtained from the positive problem, and the noise resistance of the algorithm was added to B1+. The simulation results of electrical conductivity and dielectric constant and the average relative error of the reference fruit were 4.71% and 11.32%, respectively. When the signal to noise ratio is greater than 30 d B after the noise is added, the noise will not affect the imaging results. It is proved that the image with high resolution and high precision can be obtained without excitation, and it has high feasibility and great potential for early diagnosis of disease.
【作者单位】： 中国计量大学信息工程学院;
【基金】：国家自然科学基金青年科学基金资助项目(51107130)
【分类号】：R737.9;TP391.41
，
本文编号：2130259
[Abstract]:The electrical characteristic imaging (MR-EPT) technology based on radio frequency imaging (MRI) is used to reconstruct the electrical conductivity and permittivity of biological tissues by magnetic resonance (MRI). The high resolution and high precision images can be obtained without injection of current. A simple breast fabric model is established by using XFDTD software, and a 16 pass is used under the Larmor frequency of 128 MHz. Simulation experiments were carried out on the radio frequency coil. The distribution of electrical conductivity and electrical properties of the breast tissue was reconstructed according to the amplitude and phase of the B1+ field obtained from the positive problem, and the noise resistance of the algorithm was added to B1+. The simulation results of electrical conductivity and dielectric constant and the average relative error of the reference fruit were 4.71% and 11.32%, respectively. When the signal to noise ratio is greater than 30 d B after the noise is added, the noise will not affect the imaging results. It is proved that the image with high resolution and high precision can be obtained without excitation, and it has high feasibility and great potential for early diagnosis of disease.
【作者单位】： 中国计量大学信息工程学院;
【基金】：国家自然科学基金青年科学基金资助项目(51107130)
【分类号】：R737.9;TP391.41
，
本文编号：2130259
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