Concept

Systemic bias

Publications associées (37)

Bias Field Correction in Magnetic Resonance Images of a Rat Brain

Jean-Philippe Thiran, Rolf Gruetter, Meritxell Bach Cuadra, Nathalie Just, Xavier Pena Pina

Magnetic Resonance Imaging (MRI) is nowadays a widely used medical tool, as it is a non-invasive and non-harmful way to study inner soft tissues. One of the characteristics of this method is the bias field, also called Intensity In-homogeneity (IIH), which ...

2007

A maximum likelihood approach to two-dimensional crystals

Henning Paul-Julius Stahlberg

Maximum likelihood (ML) processing of transmission electron microscopy images of protein particles can produce reconstructions of superior resolution due to a reduced reference bias. We have investigated a ML processing approach to images centered on the u ...

Elsevier BV2007

Crossover between extrinsic and intrinsic dielectric loss mechanisms in SrTiO3 thin films at microwave frequencies

Nava Setter, Alexander Tagantsev, Konstantin Astafiev

The do bias field. dependence of the dielectric loss in SrTi03 thin films deposited onto MgO substrate is investigated. The experimental data obtained at different frequencies of the ac field (8 and 16 GHz) from differently processed films (as deposited an ...

2004

Simultaneous Registration and Bias Correction of Brain Intra-operative MR Images

Jean-Philippe Thiran, Torsten Butz, Benoît Macq, Mathieu De Craene

Intra-operative MR imaging is an emerging tool for image guided (neuro)surgery. Due to the small size of the magnets and the short acquisition time, the images produced by such devices are often subject to distortions. In this work, we show the particular ...

SPIE2003

Une première mesure lidar combinée d'ozone et de vent, à partir d'une instrumentation et d'une méthodologie coup par coup

During these last decades, air pollution has drawn the attention of scientists because of the deterioration of the human environment that it has caused. Unfortunately, the study of this dynamic phenomenon is very complex and requires the use of models that ...

EPFL1996

The I-V Characteristics of Double-Barrier Stair-Wells

Giorgio Margaritondo, Gergely Papp

We investigated the I-V characteristics of the double barrier stair-well structure. Resonant tunneling current is achieved by application of an electric field, which increases the transmission under positive bias and decreases it under the reverse bias. Th ...

1995

Free energies and phase equilibria of chain molecules

Berend Smit

In this Article, a review is presented of recent developments in Monte Carlo simulations of chain molecules. The Rosenbluth chain insertion technique is used to calculate the free energy of the chain molecules. Furthermore, this insertion method is used to ...

1994

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