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.

---

Sommaire