Abstract #4183

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

Eugene Milshteyn^1,2, Georgy D. Guryev³, Elfar Adalsteinsson^3,4,5, Jacob K. White³, Lawrence L. Wald^1,2,5, and Bastien Guerin^1,2

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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