Magnetoacoustic tomography with magnetic induction (MAT-MI)
Magnetoacoustic tomography with magnetic induction (MAT-MI)
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DOI：
10.1088/0031-9155/50/21/015
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发表时间：
2005-11-07
影响因子：
3.5
通讯作者：
He, B
中科院分区：
文献类型：
--
作者：
Xu, Y;He, B
我们报告我们的理论和实验研究的一种新的成像模式，磁声断层扫描与磁感应（MAT-MI）。在MAT-MI中，样品位于静磁场和时变（μ s）磁场中。时变磁场在样品中感应出涡电流。因此，样品将通过洛伦兹力发射超声波。超声波信号被收集在物体周围，以重建与样品中的电阻抗分布相关的图像。MAT-MI结合了电阻抗断层成像的良好对比度和超声成像的良好空间分辨率。由于感应电场的螺线管性质，MAT-MI具有两个独特的功能。首先，MAT-MI可以提供一个明确的或简单的定量重建算法的电阻抗分布。其次，它有望消除其他成像方式的屏蔽效应，其中电流直接与电极一起施加。在理论部分，我们给出了MAT-MI的正问题和逆问题的计算公式，并对生物组织中的信号幅度进行了估计。在实验部分，介绍了实验装置和方法，并给出了MAT-MI的信号和金属物体的图像。有前途的试点实验结果表明所提出的MAT-MI方法的可行性。
We report our theoretical and experimental investigations on a new imaging modality, magnetoacoustic tomography with magnetic induction (MAT-MI). In MAT-MI, the sample is located in a static magnetic field and a time-varying (mu s) magnetic field. The time-varying magnetic field induces an eddy current in the sample. Consequently, the sample will emit ultrasonic waves by the Lorentz force. The ultrasonic signals are collected around the object to reconstruct images related to the electrical impedance distribution in the sample. MAT-MI combines the good contrast of electrical impedance tomography with the good spatial resolution of sonography. MAT-MI has two unique features due to the solenoid nature of the induced electrical field. Firstly, MAT-MI could provide an explicit or simple quantitative reconstruction algorithm for the electrical impedance distribution. Secondly, it promises to eliminate the shielding effects of other imaging modalities in which the current is applied directly with electrodes. In the theoretical part, we provide formulae for both the forward and inverse problems of MAT-MI and estimate the signal amplitude in biological tissues. In the experimental part, the experimental setup and methods are introduced and the signals and the image of a metal object by means of MAT-MI are presented. The promising pilot experimental results suggest the feasibility of the proposed MAT-MI approach.