International Society for Industrial Process Tomography

Structure Optimization of Cambered
Magnetic Induction Tomography

Zhili Xiao, Chao Tan^*, Feng Dong

Tianjin Key Laboratory of Process Measurement and Control

School of Electrical and Information Engineering, Tianjin University, Tianjin, China

^*Email: tanchao@tju.edu.cn

ABSTRACT

The cylindrical and hemispherical coil structures of magnetic induction tomography (MIT) are widely studied for hemorrhage detection. The sensitivity at the center of the region of interest (ROI) is bad and the sensing coils opposite to a peripheral perturbation contribute little information while reconstructing images. In order to improve the near subsurface sensitivity and make the most of coils, an open cambered MIT coil structure is proposed for local imaging of hemorrhage. The sensitivity performance of the cambered MIT coil structure was studied and compared with a cylindrical MIT. Then sensitivities of cambered MIT with different coil numbers, coil spacing and coil size are calculated to optimize the coil structure. The results show that the sensitivity of the cambered MIT is much better than cylindrical MIT near subsurface. The 16-coil structure was the optimal due to the best sensitivity and the most independent measurements. For coil spacing and inner diameter, when these two factors decrease, the sensitivity increases within 25mm distance but decreases range from 25mm to 65mm distance. So the optimal coil spacing and inner diameter should consider the trade-off between the detective depth and the sensitivity. The cambered MIT coil array provides an open and more portable way for local imaging and improves the precision of extra-axial hemorrhage imaging.

Keywords Cambered coil array, coil optimization, magnetic induction tomography, sensitivity matrix

Industrial Application Healthcare