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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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