(A) measurement method of magnetic susceptibility effect in high field NMR imaging

Abstract

In a high field NMR imaging, chemical shift, main magnetic field inhomogeneity and magnetic susceptibility effects result in some artifacts on image and their artifacts are nearly same. This artifacts are shown as the position shift and the change of image intensity. Among these effects, the magnetic susceptibility term gives severe geometrical shifts and the overlap of image intensity locally, so that the image can be misunderstood. This thesis proposes a new method with which the magnetic susceptibility effect is measured without any influences of chemical shift and magnetic field inhomogeneity. Some experimental results of the proposed method show that this method is useful to measure magnetic susceptibility effect.