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.