The forward and inverse problem of cardiac magnetic fields based on concentric ellipsoid torso-heart model  

作　　者：王倩 华宁 唐雪正 陆宏 马平 唐发宽 

机构地区：[1]Department of Cardiology,the 309th Hospital of PLA [2]Department of Physics,State Key Laboratory for Artificial Microstructure and Mesoscopic Physics,Peking University

出　　处：《Chinese Physics B》2010年第8期276-286,共11页中国物理B（英文版）

基　　金：Project supported by the State Key Development Program for Basic Research of China(Grant No.2006CB601007);the National Natural Science Foundation of China(Grant No.10674006);the National High Technology Research and Development Program of China(Grant No.2007AA03Z238)

摘　　要：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 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 is 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.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 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 is 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.

关 键 词：concentric ellipsoid torso-heart model boundary element method current dipole array reconstruction optimal constrained linear inverse method 

分 类 号：R318.0[医药卫生—生物医学工程]