Nina Eriksson Bylund

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Radiofrequency (RF) generated thermal brain lesions are widely used in functional neurosurgery. The size, shape and development of the lesions depends on system parameter settings and the electrode configuration. Difficulties in studying the effect of these factors in vivo stimulated us to develop an in vitro system for standardized comparison between(More)
A method for detecting and reducing reverberation artifacts in ul-trasound image sequences is described. A reverberation artifact localization map is produced using local Rf-bandwidth estimation. To reduce the artifacts an ideal 3D (2D + time) Wiener filter function is computed by using the reverberation map to interactively produce an estimate of the noise(More)
The aim of this work is to evaluate the wide range frequency estimation as a tool for segmentation of contrast echocardio-graphic images and improvement of image quality. By this approach not only the fundamental component of the signal spectra is utilized, but also the harmonics. We found that no distinct areas of homogeneous local frequency could be(More)
One of the most common artifacts in ultrasound imaging is reverberations. These are multiple reflection echoes that register as coming from a deeper region than the depth of the interface that are causing them, and result in ghost echoes in the ultrasound image. A method to reduce these unwanted artifacts using a three dimensional (2D + time) Wiener filter(More)
OBJECTIVES/HYPOTHESIS To develop a clinical prognostic model to identify Bell's palsy patients with risk for nonrecovery at 12 months. STUDY DESIGN Data from a prospective, randomized, double-blind, placebo-controlled, multicenter study. METHODS There were 829 patients with Bell's palsy randomized in a factorial fashion to treatment with prednisolone or(More)
One of the most frequently occuring artifacts in ultrasound imaging is reverberations. These are multiple reflection echoes that result in ghost echoes in the ultrasound image. A method for reducing these unwanted artifacts using a three-dimensional (3D) Wiener filter is presented. The Wiener filter is a global filter and produces an estimate of the(More)
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