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Abstract #4183

Patient-specific Implant Safety Assessment using Low-SAR Reverse Polarization Imaging and a Fast Electromagnetic Solver

Eugene Milshteyn1,2, Georgy D. Guryev3, Elfar Adalsteinsson3,4,5, Jacob K. White3, Lawrence L. Wald1,2,5, and Bastien Guerin1,2
1Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Dept of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 4Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 5Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, United States

Current characterization of RF-heating in orthopedic implants is based on electromagnetic simulations models and phantom experiments. However, these approaches may not accurately characterize the implant heating within a specific patient’s anatomy. A personalized medicine approach, whereby the patient-specific implant/body model is generated as the patient is in the scanner, may provide more accurate safety limits. In this study, we developed a low-SAR, fast methodology to scan and segment the implant and surrounding tissue, and calculate the 1g local SAR. Our combination of MSVAT-SPACE, reverse polarization PETRA, and a fast electromagnetic solver yields local SAR estimates in under 6 minutes.

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