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Items for "inverse problem"

Cortical Potential Imaging of Brain Electrical Activity by Means of Parametric Projection Filter

OBJECTIVES: The objective of this study was to explore suitable spatial filters for inverse estimation of cortical potentials from the scalp electroencephalogram...

Keywords: High resolution EEG, cortical potential imaging, inverse problem, parametric projection filter, noise covariance

01/2004 | Methods of Information in Medicine, Schattauer

A Signal Processing Pipeline for Noninvasive Imaging of Ventricular Preexcitation

Objectives: Noninvasive imaging of the cardiac activation sequence in humans could guide interventional curative treatment of cardiac arrhythmias by catheter ablation...

Keywords: Adenosine, cardiac electrophysiology, inverse problem, R-peak detection, signal classification

01/2005 | Methods of Information in Medicine, Schattauer

Computationally Efficient Noninvasive Cardiac Activation Time Imaging

Objective: The computer model-based computation of the cardiac activation sequence in humans has been recently subject of successful clinical validation...

Keywords: cardiac electrophysiology, computer modeling, inverse problem

01/2005 | Methods of Information in Medicine, Schattauer

Cortical Dipole Imaging of Movement-related Potentials by Means of Parametric Inverse Filters Incorporating with Signal and Noise Covariance

OBJECTIVE: The objective of this study is to explore suitable spatial filters for inverse estimation of cortical equivalent dipole layer imaging from the scalp electroencephalogram...

Keywords: High-resolution EEG, cortical dipole imaging, inverse problem, parametric Weiner filter, signal and noise covariance, movement-related potential

01/2007 | Methods of Information in Medicine, Schattauer

Surrogate functionals and thresholding for inverse interface problems

We propose a new algorithm for computing regularized solutions to inverse problems where the unknown functions is a characteristic function and where the forward operator is linear. Our approach can be seen as an alternative to the level-set method and is based on an efficient computation of minimizers for a Tikhonov functional...

Keywords: inverse problem, interface problem, regularization, thresholding, bounded variation, exact relaxation, surrogate functional, level set method, topological derivative

07/2007 | Journal of Inverse and Ill-posed Problems, Walter de Gruyter