Abstract #3176

Single Point Imaging with Broadband Excitations and Ultra-Short Echo Times for Imaging near Metallic Implants

Curtis Wiens¹, Nathan S. Artz^1,2, Hyungseok Jang¹, Alan McMillan¹, Kevin Koch³, and Scott B. Reeder^1,4,5,6,7

¹Radiology, University of Wisconsin, Madison, WI, United States, ²Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN, United States, ³Biophysics and Radiology, Medical College of Wisconsin, Milwaukee, WI, United States, ⁴Medical Physics, University of Wisconsin, Madison, WI, United States, ⁵Biomedical Engineering, University of Wisconsin, Madison, WI, United States, ⁶Medicine, University of Wisconsin, Madison, WI, United States, ⁷Emergency Medicine, University of Wisconsin, Madison, WI, United States

Large magnetic susceptibility differences between metallic implants and tissue generate severe B₀ inhomogeneities that present several challenges for MR: excitation of the entire off-resonance spectrum, distortion in the frequency encoding direction, and severe intra-voxel dephasing. In this work we propose an ultra-short echo time acquisition with broadband excitation. Single point encoding was use to avoid in-plane distortions while 3D undersampling facilitated clinically feasible acquisition times. The effects of RF pulse duration on signal loss near the implant and T₁ weighting were evaluated in a total hip replacement phantom and a volunteer with a total knee replacement.

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