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Abstract #4141

A Noval MR-Compatible and Clinically Available Microwave Needle for Spherical Ablation: Design and Ex Vivo Validation at a 0.7T

Xiaoyan Huang1, Yufu Zhou1, and Bensheng Qiu1
1University of Science and Technology of China, Hefei, China

A novel MR-compatible microwave needle is proposed to achieve spherical ablation and monitor the temperature of needle shaft. It has an asymmetrical dipole choke with titanium alloy tube and a conical tip made of solid zirconia to facilitate needle insertion into tissues. FDTD simulations are used to minimize reflection coefficient and maximize aspect ratio. This most optimal design was validated in ex vivo pork liver in a 0.7T open MR system and concluded an acceptable artifacts, reflection coefficient of -27.86 dB and near-spherical ablation zone with a length of 39.5 mm, a diameter of 34.5 mm at 50W, 5 min.

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