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Abstract #2311

Metal artifact reduction using MAVRIC in the presence of common orthodontic appliances

Jeff A. Kohlmeier 1 , Heidi A. Edmonson 2 , Joel P. Felmlee 2 , David W. Stanley 3 , Fred J. Regennitter 1 , and John E. Volz 1

1 Department of Orthodontics, Mayo Clinic, Rochester, MN, United States, 2 Department of Radiology, Mayo Clinic, Rochester, MN, United States, 3 GE Healthcare, Rochester, MN, United States

Orthodontic appliances are well known to produce artifact and geometric distortion in MR imaging of the head and neck. The goal of this study was the quantify the extent of susceptibility artifact induced by common orthodontic appliances and to evaluate the utility of MAVRIC for imaging near the appliances. Various appliances configurations were imaged on an anthropomorphic phantom utilizing T2FSE, T1 Cube, T1 MAVRIC and SL MAVRIC sequences. Our results show a large reduction in signal void when comparing MAVRIC to both T2 FSE and T1 Cube sequences for all appliances (51% and 83% reduction respectively). These results suggest that MAVRIC could decrease the frequency of appliance removal for MR imaging and could be used as a problem solving sequence for tissues near the appliance.

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