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Abstract #1678

Approach to characterize magnetic inhomogenities for development of MRI sequences near metallic prostheses

Matthew R. Smith 1 , Nathan S. Artz 1 , and Scott B. Reeder 1,2

1 Radiology, University of Wisconsin, Madison, Wisconsin, United States, 2 Biomedical Engineering, University of Wisconsin, Madison, WI, United States

Metallic implants induce extremely large B0 field perturbations that cause severe signal distortion. The purpose of this work is to examine the theoretically induced field map perturbation using the digital representation of commercially available metallic joint prostheses. Simulations presented here demonstrate that both RF excitation and frequency encoding is highly problematic for these implants using current 3D-MSI methods at both field strengths. Fully phase encoded methods may help with the frequency-encoding distortion but not with RF excitation limitations.

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