Purpose Radiofrequency (RF) ablation with mono- or bipolar electrodes is a common procedure for hepatocellular carcinoma (HCC) with a low rate of recurrence for small size tumors. For larger lesions and/or non-round/ellipsoid shapes RF ablation has some limitations and generally does not achieve comparable success rates to microwave ablation or high-intensity focused ultrasound therapies. Materials and methods To shape RF ablations for matching a tumor size and geometry, we have developed an electronic channel switch box for two bipolar needles that generates multiple selectable ablation patterns. The setup can be used with commercially available mono- or bipolar RF generators. The switch box provides ten selectable ablation procedures to generate different ablation patterns without a relocation of a needle. Five patterns were exemplary generated in ex vivo tissue of porcine liver and chicken breast and visually characterized. Results Different ablation patterns, e.g., in a L- or U-shape, were achieved. In chicken breast a maximum ablation with a diameter of 4.3 cm was obtained and in porcine liver 2.8 cm with electrodes of 0.9 cm length. Conclusion The resulting ablations with the electronic switch box and two bipolar needles show the potential ability to manage RF therapies of complex and large
International Journal of Computer Assisted Radiology and Surgery – Springer Journals
Published: Apr 20, 2018
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