For the brain, a variety of automated non-iterative shimming methods using phase evolution derived B0 maps have been reported. These methods assume that there is only a single chemical species contributing to the image. Although true in the brain, lipid contributions from skin, bone marrow and structural fat, may approach or exceed the concentration of water in other organs. In these instances, standard B0 mapping methods cannot be used due to contributions arising from the lipids. To overcome these limitations the present invention discloses a multi-point B0 mapping method combined with Dixon imaging to provide fully automated shimming of the human calf.
Non iterative shimming in magnetic resonance imaging in the presence of high LIPID levels