Susceptibility artifact correction in GE images
BELAROUSSI B, BENOIT-CATTIN H, ODET C
CREATIS Laboratory - CNRS UMR 5515 - INSERM U 630
In Gradient Echo (GE) images, susceptibility artifact induces both intravoxel dephasing and pixel shifting leading to intensity and geometric distortions that may disturb image analysis. In this work, we propose an original image-processing based correction method in GE MR Images when a field map of the imaged object is known. Susceptibility artifact impact is modeled by means of pixel shifting map and intensity distortion map. An original image processing scheme based on MRI simulation is used to build the intensity distortion map to take into account intravoxel dephasing. The proposed method has been successfully tested in real images.