1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, United States; 2Martinos Center for Biomedical Imaging, Dept. of Radiology, MGH, Charlestown, MA, United States; 3Dept. of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States; 4Harvard-MIT Health Sciences and Technology, Cambridge, MA, United States
We demonstrated that dipole elements can be used with loop arrays to reduce the local SAR in spine imaging. We placed dipole elements in the middle of each loop of a previously constructed spine array. Adding excitation by the dipoles did not alter the overall B1+ pattern around the spinal cord significantly, yet the 10 g peak local SAR and the global SAR in a human model was reduced by energizing the dipole elements at 7 T.