S. Balac & G. Caloz
Titre:
"Mathematical modeling and numerical simulation of magnetic
susceptibility artifacts in Magentic Resonance Imaging"
Abstract:
The technique used to spot information in Magnetic Resonance Imaging (MRI)
is based on electromagnetic fields. To a strong homogeneous magnetic
field (order of magnitude around one Tesla) is added a linearly
varying field (around $10^{-2}$ Tesla per meter). When these fields
are disturbed by the presence of a paramagnetic material in the sample
for instance, the resulting image is usually distorted, these
distortions are called artifacts. Our goal is to present a method,
assuming the field disturbances are known, to construct the images.
A mathematical model of the MRI process is developed. The
way the images are distorted in intensity
and shape is explained and an algorithm to simulate
magnetic susceptibility artifacts is deduced.
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Sommaire