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RF-ablation pattern shaping employing switching channels of dual bipolar needle electrodes: ex vivo results

  • Original Article
  • Published:
International Journal of Computer Assisted Radiology and Surgery Aims and scope Submit manuscript

A Correction to this article was published on 03 July 2018

This article has been updated

Abstract

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 \(4.3\, \hbox {cm}\) was obtained and in porcine liver \(2.8\, \hbox {cm}\) with electrodes of \(0.9\, \hbox {cm}\) 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 tumor geometries. Next steps would be to validate the actual tissue ablation volumes in further ex vivo and preclinical studies and against simulation results.

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Change history

  • 03 July 2018

    The original version of this article was published without funding note. The funding note is given below.

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Acknowledgements

Equipment for this study was partly provided by the Olympus Winter & Ibe GmbH of the Olympus Surgical Technologies Europe.

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Authors and Affiliations

  1. Department of Medical Engineering, Otto-von-Guericke University, Magdeburg, Saxony-Anhalt, Germany

    Jens Ziegle, Johannes Krug, Ghazanfar Ali & Michael Friebe

  2. Department of Computer Science, Johns Hopkins University, Baltimore, MD, USA

    Chloé Audigier, Younsu Kim & Emad M. Boctor

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  1. Jens Ziegle
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  2. Chloé Audigier
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  3. Johannes Krug
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  4. Ghazanfar Ali
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  7. Michael Friebe
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Correspondence to Jens Ziegle.

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This article does not contain any studies with human participants or animals performed by any of the authors. This article does not contain patient data.

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Ziegle, J., Audigier, C., Krug, J. et al. RF-ablation pattern shaping employing switching channels of dual bipolar needle electrodes: ex vivo results. Int J CARS 13, 905–916 (2018). https://doi.org/10.1007/s11548-018-1769-8

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  • DOI: https://doi.org/10.1007/s11548-018-1769-8

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