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Abstract #4140

Investigation of the impact of RF heating on the treatment temperature during MRI-guided cryoablation at 1.5T

Aiming Lu1, David A Woodrum1, Christopher P Favazza1, Joel P Felmlee1, Brian T Welch1, Jacinta Browne1, and Krzysztof R Gorny1
1Radiology, Mayo Clinic, Rochester, MN, United States

MRI-guided cryoablation is a promising minimal invasive approach to treat localized tumors. Since the cryoneedles used in this system are metallic and the gas lines have metallic components, RF heating could occur during MR imaging. Our phantom study demonstrated temperature increase of more than 100 °C due to a sequence with moderate SAR of 2.1W/kg.In this work, we demonstrate that RF heating caused by the real-time monitoring MRI sequence could potentially affect the temperature course near the cryoneedles and therefore affect the treatment efficacy, especially when angiocath was used to aid the cryoneedle placement.

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