Saifeng Liu1, Jaladhar Neelavalli2,
Weili Zheng3, Ewart Mark Haacke2,4
1School of Biomedical
Engineering, McMaster University, Hamilton, Ontario, Canada; 2The
Magnetic Resonance Imaging Institute for Biomedical Research, Detroit, MI,
United States; 3Biomedical Engineering, Wayne State University,
Detroit, MI, United States; 4Academic Radiology, Wayne State
University, Detroit, MI, United States
The forward calculation enables us to predict and remove the background field variation. However, it becomes insufficient when the eddy currents are considerable. We proposed to add an polynomial fitting to the forward calculation. With this new method, the background filed variation can be properly fitted and most of the phase artifacts were removed. This allows us to use a high-pass filter with smaller size to reduce the error in susceptibility mapping.