In this paper, a new imaging method to determine the position of blood effusions or edemas in the deep position of the brain by using electric current flowing through the brain is presented. Its principle is that the existence of non-normal matters in the brain cause a disturbance to boundary potentials, while a low frenqency current flows through the brain. In terms of the measurement for the change value of boundary potentials a reconstruction for the blood effusion or the edema in the deep position of the brain can be done.

Based on a 3-D inhomogeneous simulative body torso model, the influence of various boundary conditions on inverse recovered epicardial potential maps (EPM) was studied by boundary element method (BEM). The result shows that the precision of EPM calculated under incomplete boundary conditions will meet the clinical requirements, as long as the incomplete boundary conditions still contain the extremum area which often appears at the breast area.
Action Potentials ; Algorithms ; Body Surface Potential Mapping ; Computer Simulation ; Electrocardiography ; Heart ; physiology ; Humans ; Mathematics ; Membrane Potentials ; physiology ; Microcomputers ; Models, Cardiovascular