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Abstract #0132

Imaging of Metallic Implant Using 3D Ultrashort Echo Time (3D UTE) Pulse Sequence

Jiang Du1, Kelly Borden1, Eric Diaz1, Mark Bydder1, Won Bae1, Shantanu Patil2, Graeme Bydder1, Christine Chung1

1Radiology, University of California, San Diego, CA, United States; 2Shiley Center for Orthopedic Research and Education, La Jolla, CA, United States

Magnetic resonance imaging (MRI) near metal implants suffers from severe artifacts due to large metal-induced field inhomogeneities. The steep field gradients near metal implants result in increased intra-voxel dephasing and a much shortened T2*. Clinical gradient echo (GE) sequences suffer from large signal loss. Spin echo (SE) type sequences only partly refocus the dephased spins, resulting in spatially dependent signal voids and pile-ups. Here we present a 3D ultrashort TE (UTE) sequence which employs short hard pulse excitation and 3D radial sampling with a nominal TE of 8 s to image metallic implants with markedly reduced artifact.