Meeting Banner
Abstract #3176

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

Curtis Wiens1, Nathan S. Artz1,2, Hyungseok Jang1, Alan McMillan1, Kevin Koch3, and Scott B. Reeder1,4,5,6,7

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.

This abstract and the presentation materials are available to members only; a login is required.

Join Here