In this study, electromagnetic simulation was used to calculate RF heating for the patients with metallic gamma knife stereotaxic headframe in MRI. The relationship between headframe structure parameters and patient SAR was investigated. Two effective SAR derating methods of adjusting the headframe structure parameters were proposed, which can significantly decrease 10 g local SAR from 253 W/kg to 68 W/kg and head SAR from 4.2 W/kg to 2.0 W/kg. This study provides the efficient and reliable methods to ensure safety of the patients with metallic gamma knife headframe in MRI.
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