發(fā)布時間：2018-07-17 16:36

【摘要】：基于射頻成像的電特性成像(MR-EPT)技術(shù)利用磁共振(MRI)射頻場對生物組織電導(dǎo)率和介電常數(shù)進行重建,無需注入電流即可獲得高分辨率和高精度的圖像。研究采用XFDTD軟件建立了簡單的乳腺組織模型,在128 MHz的拉莫爾頻率下采用16通道射頻線圈進行仿真實驗。實驗根據(jù)正問題得到的B1+場的幅值和相位重構(gòu)出了乳腺組織電導(dǎo)率和電特性分布,并對B1+添加噪聲研究算法的抗噪性。實驗得出,電導(dǎo)率和介電常數(shù)的仿真結(jié)果和參照結(jié)果的平均相對誤差分別為4.71%和11.32%,當添加噪聲后信噪比大于30 d B時,噪聲不會對成像結(jié)果造成影響。證明了MR-EPT無需激勵即可獲得高分辨率和高精度的圖像,在早期疾病診斷方面有著較高的可行性和極大的發(fā)展?jié)摿Α?br/>[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.
【作者單位】： 中國計量大學信息工程學院;
【基金】：國家自然科學基金青年科學基金資助項目(51107130)
【分類號】：R737.9;TP391.41
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本文編號：2130259