The test method for safety assessment with regard to radiofrequency (RF) heating of small metallic medical implants in MRI is standardized by ASTM. However, the focus lies on individual or electrically connected implant systems whereas, the none-electrically connected combination of multiple adjacent implants has not yet been sufficiently investigated and may lead to considerably altered RF coupling. In this study, we assessed induced heating as a function of the separation distance between two orthopedic metallic implants. Results show that the strong coupling between two short implants may lead to even higher temperature increases than that of a single implant of the combined length.
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