Li Xu, He Bin
University of Minnesota, Minneapolis, MN 55455, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:3173-6. doi: 10.1109/IEMBS.2009.5334511.
Magnetoacoustic tomography with magnetic induction (MAT-MI) is a recently introduced method for imaging electrical conductivity properties of biological tissue with high spatial resolution close to sonography. In MAT-MI the sample resides in a static magnetic field and a time-varying magnetic stimulation is applied to the sample volume. Through the action of the Lorentz force, the magnetically induced eddy current in the conductive sample causes particle vibrations and generates detectable ultrasound waves. The acoustic signal is then measured around the object to reconstruct images that are related to the object electrical conductivity distribution. The feasibility to reconstruct high spatial resolution conductivity images using MAT-MI method has been demonstrated by both computer simulation and experimental studies. Though MAT-MI technique is still in its developing stage, all the pilot studies suggest that it has potential to become a noninvasive imaging modality for high spatial resolution conductivity imaging of biological tissue and merits further investigations. This paper reviews MAT-MI about its basic theory, reconstruction algorithms and experiment studies. Some technical issues and future research directions are discussed.
磁感应磁声层析成像（MAT-MI）是一种最近引入的方法，用于以接近超声检查的高空间分辨率对生物组织的电导率特性进行成像。在MAT-MI中，样本置于静磁场中，并对样本体积施加时变磁刺激。通过洛伦兹力的作用，导电样本中的磁感应涡流会引起粒子振动并产生可检测的超声波。然后在物体周围测量声学信号，以重建与物体电导率分布相关的图像。计算机模拟和实验研究均已证明使用MAT-MI方法重建高空间分辨率电导率图像的可行性。尽管MAT-MI技术仍处于发展阶段，但所有初步研究均表明，它有潜力成为用于生物组织高空间分辨率电导率成像的非侵入性成像方式，值得进一步研究。本文综述了MAT-MI的基本理论、重建算法和实验研究。还讨论了一些技术问题和未来的研究方向。
