Chiel J. den Harder1,
Ulrike A. Blume2, Gert van IJperen1, Clemens Bos3
1MRI
Technology Development, Philips, Best, Noord Brabant, Netherlands; 2Imaging
Systems, Philips, Hamburg, Germany; 3Image Sciences Institute,
University Medical Center Utrecht, Utrecht, Netherlands
Multi-Spectral Imaging (MSI) techniques have been shown to significantly reduce susceptibility artifacts. Especially in techniques that use gradient selection, such as Slice Encoding for Metal Artifact Correction (SEMAC), remaining ripple artifacts can be prominent. This work presents a simulation analysis verified by phantom experiments, showing that the ripple artifact appears only if B0 varies both in-plane and through-plane. As shown before, the ripple artifact is the remaining limitation of the capability of MSI techniques to reduce metal artifacts. The simulations presented here help define the origin of the ripple artifact and provide a means to investigate ways to address it.