Finite element modelling and image reconstruction for Lorentz force electrical impedance tomography
Finite element modelling and image reconstruction for Lorentz force electrical impedance tomography
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DOI：
10.1088/1361-6579/aab657
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发表时间：
2018-04
影响因子：
3.2
通讯作者：
N. Polydorides
中科院分区：
文献类型：
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作者：
N. Polydorides
目的：我们提出了一个数值框架来模拟精确的电极模型和图像重建方案，两对电极上的数据是足够的洛伦兹力电阻抗断层扫描（LFEIT）测量。方法：所采用的基于有限元的完整电极模型包括电极的几何形状和接触阻抗，考虑了接触界面处的功率损耗。对于图像重建，我们提出了一种基于修改后的J-替代算法，需要LFEIT和两对传感器上的阻抗测量，基本上不需要超过三个边界电极的方法。主要结果：我们的模拟研究的结果表明，电极建模有显着的影响，测量和电极模型的不准确性可能是有害的图像重建。对于图像重建，我们提出了一种基于修改后的J-替代算法，需要LFEIT和两对传感器上的阻抗测量，基本上不需要超过三个边界电极的方法。重要性：这允许更短的采集时间、在声学调制期间更少的声处理噪声、更简单的测量设置以及最终更简洁和有效的图像重建过程。
Objective: We propose a numerical framework to simulate the Lorentz force electrical impedance tomography (LFEIT) measurements on accurate electrode models and an image reconstruction scheme for which data on two pairs of electrodes are sufficient. Approach: The adopted finite element-based complete electrode model encompasses the electrode’s geometry and contact impedance, accounting for the power losses at the contact interface. For image reconstruction, we suggest an approach based on a modified J-substitution algorithm that requires LFEIT and impedance measurements on two pairs of sensors, essentially necessitating no more than three boundary electrodes. Main results: The results of our simulation study suggest that electrode modelling has a significant impact on the measurements and electrode model inaccuracies may be detrimental to the image reconstruction. For image reconstruction, we suggest an approach based on a modified J-substitution algorithm that requires LFEIT and impedance measurements on two pairs of sensors, essentially necessitating no more than three boundary electrodes. Significance: This allows for shorter acquisition times, less sonication noise during the acoustic modulation, a simpler measurement setup, and eventually a more succinct and efficient image reconstruction process.