The forward and inverse problem of cardiac magnetic fields based on concentric ellipsoid torso-heart model |
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| Authors: | Wang Qian Hua Ning Tang Xue-Zheng Lu Hong Ma Ping and Tang Fa-Kuan |
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| Affiliation: | Department of Cardiology, the 309th Hospital of PLA, Beijing 100091, China; Department of Physics, State Key Laboratory for Arti cial Microstructure and Mesoscopic Physics, Peking University, Beijing 100871, China |
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| Abstract: | This paper constructs a concentric ellipsoid torso-heart model by boundary element method and investigates the impacts of model structures on the cardiac magnetic fields generated by both equivalent primary source—a current dipole and volume currents. Then by using the simulated magnetic fields based on the torso-heart model as input, the cardiac current sources—an array of current dipoles by optimal constrained linear inverse method are constructed. Next, the current dipole array reconstruction considering boundaries are compared with that in an unbounded homogeneous medium. Furthermore, the influence of random noise on reconstruction is also considered and the reconstructing effect is judged by several reconstructing parameters. |
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| Keywords: | concentric ellipsoid torso-heart model boundary element method current dipole array reconstruction optimal constrained linear inverse method |
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