Abstract #3314
Quantitative Assessment of Background Field Removal Methods for Abdominal Imaging
Debra E. Horng 1,2 , Samir D. Sharma 1 , Diego Hernando 1 , and Scott B. Reeder 1,2
1
Radiology, University of Wisconsin-Madison,
Madison, WI, United States,
2
Medical
Physics, University of Wisconsin-Madison, Madison, WI,
United States
Background field removal is a necessary step for
accurate QSM (susceptibility estimation). We assess the
performance of currently used background field removal
algorithms (PDF and SHARP), in the context of abdominal
imaging. Compared to brain iron, liver iron is spatially
diffuse, highly concentrated, and situated closer to
air. Large and small containers (6cm and 1.6 diameters)
containing gadolinium dilutions, positioned both close
and far from air, produced field maps; the dilutions
corresponded to susceptibilities of -7.3, -5.6, -3.9,
and -2.1 ppm. Both PDF and SHARP result in less than 0.6
Hz/voxel error in the local field estimate.
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