Electrical impedance tomography reconstruction algorithm based on general inversion theory and finite element method.
A strict EIT reconstruction algorithm, the general inversion algorithm (GIA) is presented. To improve the noise performance, the algorithm is modified by attenuating the condition number of the forward matrix F and implemented using an improved FEM scheme, to obtain the 2D image of impedance change (dynamic image). This modified general inversion algorithm (MGIA) can be used on a larger dimension FEM model (248 elements) and is more practical than the GIA. When implementing this algorithm in computer simulation and in a physical phantom, it is found that the MGIA has a smaller reconstruction error than the currently used algorithms (equipotential-back-projection algorithm and filtered spectral expansion algorithm). With 0.1% white noise in the data, the algorithm can still reconstruct images of a complicated model. Further improvements are also discussed.
Mengxing
T
T
Biomedical Engineering Department, Fourth Military Medical University, Xian, Shaanxi, People's Republic of China. bmee@fmmu.edu.cn
Xiuzhen
D
D
Mingxin
Q
Q
Feng
F
F
Xuetao
S
S
Fusheng
Y
Y
D000465:Algorithms; D017097:Electric Impedance; D020342:Finite Element Analysis; D006801:Humans; D014054:Tomography / Q000379:methods*