Hledat
Zobrazují se záznamy 1-10 z 35
A common formalism for the integral formulations of the forward EEG problem
(IEEE, 2005-01)
The forward electroencephalography (EEG) problem involves finding a potential V from the Poisson equation ∇·(σ∇V)=f, in which f represents electrical sources in the brain, and σ the conductivity of the head tissues. In the ...
Parallel integral projection transform for straight electrode localization in 3-D ultrasound images
(IEEE, 2008-07)
In surgical practice, small metallic instruments are frequently used to perform various tasks inside the human body. We address the problem of their accurate localization in the tissue. Recent experiments using medical ...
Spatio-Temporal Nonrigid Registration for Ultrasound Cardiac Motion Estimation
(IEEE, 2005-09)
We propose a new spatio-temporal elastic registration algorithm for motion reconstruction from a series of images. The specific application is to estimate displacement fields from two-dimensional ultrasound sequences of ...
Generalized Sampling: A Variational Approach. Part I: Theory
(IEEE, 2002-08)
We consider the problem of reconstructing a multidimensional vector function fin: Rm→Rn from a finite set of linear measures. These can be irregularly sampled responses of several linear filters. Traditional approaches ...
Unwarping of Unidirectionally Distorted EPI Images
(IEEE, 2000-02)
Echo-planar imaging (EPI) is a fast nuclear magnetic resonance imaging (MRI) method. Unfortunately, local magnetic field inhomogeneities induced mainly by the subject's presence cause significant geometrical distortion, ...
Fast Parametric Elastic Image Registration
(IEEE, 2003-11)
We present an algorithm for fast elastic multidimensional intensity-based image registration with a parametric model of the deformation. It is fully automatic in its default mode of operation. In the case of hard real-world ...
Generalized Sampling: A Variational Approach. Part II: Applications
(IEEE, 2002-08)
The variational reconstruction theory from a companion paper finds a solution consistent with some linear constraints and minimizing a quadratic plausibility criterion. It is suitable for treating vector and multidimensional ...
Line filtering for detection of microtools in 3D ultrasound data
(IEEE, 2009-09)
We propose a robust method for localization of elongated surgical tools in 3D ultrasound data based on shape analysis. The tubular structures in input data are enhanced by a line filter in the pre-processing phase. A new ...
Discrete curvature calculation for fast level set segmentation
(IEEE, 2009-11)
Fast level set methods replace continuous PDEs by a discrete formulation, improving the execution times. The regularization in fast level set methods was so far handled indirectly via level set function smoothing. We propose ...
Fast no ground truth image registration accuracy evaluation: Comparison of bootstrap and Hessian approaches
(IEEE, 2008-05)
Image registration algorithms provide a displacement field between two images. We consider the problem of estimating accuracy of the calculated displacement field from the input images only and without assuming any specific ...