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Abstract #4170

A Comparison of RF-Induced Heating for a Range of Titanium Rods at 1.5T and 3T

Jessica A Martinez1,2, Kevin Moulin3, and Daniel B Ennis3

1Bioengineering, University of California, Los Angeles, Los Angeles, CA, United States, 2Radiological Sciences, University of California Los Angeles, Los Angeles, CA, United States, 3Radiological Sciences Lab, Radiological Sciences, Stanford University, Stanford, CA, United States

RF induced heating is a principal concern for patients with active implantable medical devices (AIMDs). MRI exams at >1.5T are often avoided, largely because the SAR increases with the square of field strength, thus RF-induced heating is expected to increase. RF induced heating, however, also arises because of the antennae-like characteristics of the AIMD. Our objective was to compare RF-induced heating in rods with different lengths at 1.5T and 3T when the same B1+RMS was applied. Results suggest that for a specific device length, RF-induced heating is not always higher for increasing field strength.

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