Forward problem solution of EMSI of the human brain using a new FEM Formulation with realistic head model

Özdemir, Mehmet Kemal


Forward problem solution of electro-magnetic source imaging of the human brain using a new boundary element method formulation with realistic head model
Tanzer, Ihsan Oğuz; Gençer, Nevzat Güneri; Department of Electrical and Electronics Engineering (1998)
Forward problem solution of electromagnetic source imaging using a new BEM formulation with high-order elements
Gençer, Nevzat Güneri (IOP Publishing, 1999-09-01)
Representations of the active cell populations on the cortical surface via electric and magnetic measurements are known as electromagnetic source images (EMSIs) of the human brain. Numerical solution of the potential and magnetic fields for a given electrical source distribution in the human brain is an essential part of electromagnetic source imaging. In this study, the performance of the boundary element method (BEM) is explored with different surface element types. A new BEM formulation is derived that m...
Forward problem of electrocardiography in terms of 3D transmembrane potentials using COMSOL
Bedir, Gizem; Serinağaoğlu Doğrusöz, Yeşim; Çetin, Barbaros; Department of Biomedical Engineering (2015)
Computation of body surface potentials from equivalent cardiac sources is called as forward problem of electrocardiography (ECG). There exist different solution meth- ods for solving the forward ECG problem. These solution methods depend on the choice of the equivalent cardiac sources. In this study, bidomain model based trans- membrane potential (TMP) distribution is used as equivalent cardiac source to exam- ine the cellular electrophysiology macroscopically. With this type of source defini- tion, the TMP...
Forward Problem Solution for Contactless Electrical Conductivity Imaging with Realistic Head Model
Zengin, Reyhan; Gençer, Nevzat Güneri (2009-01-01)
In this study, forward problem of contactless electrical conductivity imaging is solved by using realistic-head model. Realistic-head model is modelled by a single volume with the ANSYS software and divided into hexahedral elements. Conductivity information for each element is obtained from MR gray-scale images obtained as a result of segmentation. For realistic-head model, a coil of radius I cm, I cm above the scalp and carrying a sinusoidal (50 kHz) current of I A is used as a source. Realistic-head model...
Forward problem solution for electrical conductivity imaging via contactless measurements
Gençer, Nevzat Güneri (IOP Publishing, 1999-04-01)
The forward problem of anew medical imaging system is analysed in this study. This system uses magnetic excitation to induce currents inside a conductive body and measures the magnetic fields of the induced currents. The forward problem, that is determining induced currents in the conductive body and their magnetic fields, is formulated. For a general solution of the forward problem, the finite element method (FEM) is employed to evaluate the scalar potential distribution. Thus, inhomogeneity and anisotropy...
Citation Formats
M. K. Özdemir, “Forward problem solution of EMSI of the human brain using a new FEM Formulation with realistic head model,” Middle East Technical University, 1998.