Abstract #1456

RF-induced heating pattern of a partially immersed conducting implant wire at 7T – its dependence on wire length

Pallab K Bhattacharyya^1,2, Bhumi Bhusal³, Tanvir Baig³, Mark J Lowe¹, Michael Martens³, and Stephen E Jones¹

¹Imaging Institute, Cleveland Clinic, Cleveland, OH, United States, ²Radiology, Cleveland Clinic Lerner College of Medicine, Cleveland, OH, United States, ³Physics, Case Western Reserve University, Cleveland, OH, United States

Radiofrequency induced heating at 7T of an insulated wire (exposed at tip) partially immersed in ASTM gel phantom to evaluate safety of scanning partially implanted guidewires, implants like stereo electroencephalography (SEEG) electrodes at different configurations, and conducting wires at that field strength. A transmit-receive coil was used for this study. Heating at certain resonance lengths separated by half a wavelength in air was observed. The heating at resonance lengths were 3-4 times less than that reported earlier at 3T at same specific absorption rate, and under similar configurations and settings.

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