Abstract #3318
Streaking Artifacts Reduction for QSM
Hongjiang Wei 1 , Wei Li 2 , Nian Wang 1 , and Chunlei Liu 1,3
1
Brain Imaging and Analysis Center, Duke
University, Durham, NC, United States,
2
University
of Texas Health Science Center at San Antonio, TX,
United States,
3
Depatment
of Radoilogy, School of Medicine, Duke University,
Durham, NC, United States
Quantifying susceptibility from the phase image is
hampered by the ill-posed dipole filter inversion
problem. The imperfect inversion on and near the conical
surface results in streaking artifacts in the computed
susceptibility maps. In this study, we introduced a
novel image-space weighting function to suppress errors
induced by imperfect phase measurement and unwrapping.
This weighting function is applied in a joint L1 and L2
norm minimization procedure which can be solved rapidly
using SPARSA solver. A significantly lower level of
streaking artifacts is observed in the resulting
susceptibility maps. The results are comparable to those
obtained from COSMOS method, and the computation time
for the reconstruction is less than one minute for a
matrix size of 320320204
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