Lorentz force electrical impedance tomography
Lorentz force electrical impedance tomography
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DOI：
10.1016/j.irbm.2013.08.002
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发表时间：
2013-11-01
期刊：
影响因子：
4.8
通讯作者：
Lafon, C.
中科院分区：
文献类型：
--
作者：
Grasland-Mongrain, P.;Mari, J. -M.;Lafon, C.
本文描述了一种称为洛伦兹力电阻抗断层成像的方法。生物组织的电导率可以通过它们在磁场中的超声波来测量：磁场中组织的振动通过洛伦兹力感应电流。这种电流被放置在样品周围的电极检测到，与超声波压力、磁场强度和沿声轴的电导梯度成正比。通过聚焦在样品内部的不同位置，可以建立电导率梯度的地图。在这项研究中，实验是在明胶体模和牛肉样品上进行的，连续放置在300mT的磁场中，并用聚焦在21 cm的超声换能器发出500 kHz的脉冲。虽然不是所有的界面都是可见的，但在这项探索性研究中，电导率图像和超声图像之间有很好的相关性。这种方法提供了一种检测标准超声检查看不到的病理的替代方法。(C)2013年爱思唯尔·马森公司。版权所有。
This article describes a method called Lorentz Force Electrical Impedance Tomography. The electrical conductivity of biological tissues can be measured through their sonication in a magnetic field: the vibration of the tissues inside the field induces an electrical current by Lorentz force. This current, detected by electrodes placed around the sample, is proportional to the ultrasonic pressure, to the strength of the magnetic field and to the electrical conductivity gradient along the acoustic axis. By focusing at different places inside the sample, a map of the electrical conductivity gradient can be established. In this study, experiments were conducted on a gelatin phantom and on a beef sample, successively placed in a 300 mT magnetic field and sonicated with an ultrasonic transducer focused at 21 cm emitting 500 kHz bursts. Although all interfaces are not visible, in this exploratory study a good correlation is observed between the electrical conductivity image and the ultrasonic image. This method offers an alternative to detecting pathologies invisible to standard ultrasonography. (C) 2013 Elsevier Masson SAS. All rights reserved.