Younsu Kim

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

PurposeRadiofrequency (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 methodsTo 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.ResultsDifferent ablation patterns, e.g., in a L- or U-shape, were achieved. In chicken breast a maximum ablation with a diameter of

Toward dynamic lumbar punctures guidance based on single element synthetic tracked aperture ultrasound imaging

4.3\, \hbox {cm}

Physics-Based Simulation to Enable Ultrasound Monitoring of HIFU Ablation: An MRI Validation

4.3cm was obtained and in porcine liver

Correction to: Ultrasound thermal monitoring with an external ultrasound source for customized bipolar RF ablation shapes

2.8\, \hbox {cm}

Single-Element Needle-Based Ultrasound Imaging of the Spine: An In Vivo Feasibility Study

2.8cm with electrodes of