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Abstract #2152

Investigation of heating risks during MR-guided microwave ablation using applicators without active shaft cooling

Liqiang Ren1, David A Woodrum1, Krzysztof R Gorny1, Joel P Felmlee1, Scott M Thompson1, and Aiming Lu1
1Radiology, Mayo Clinic, Rochester, MN, United States


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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