Execution of MR sequences (RF-heating) and/or microwave energy during MRgMWA may lead to harmful heating at tissue surface with non-cooled MR-conditional applicators. MR imaging was performed using a high SAR sequence and several geometric orientations of phantom/applicators to assess RF-heating impact. Applicator insertion depth (with/without ultrasound gel) and spacing of two applicators on shaft heating were evaluated. Negligible temperature changes due to RF-heating were observed. Significant temperature increases were measured during MWA due to action of MWA system/applicator, which can be mitigated by increasing the applicator insertion depth. Further reduction in temperature change can be achieved by using ultrasound gel.
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