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Related Experiment Video

Updated: Jul 7, 2026

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

Which parameters are needed for targeting a multitined radiofrequency device--an approach to a simple algorithm.

Dirk L Stippel¹, Christopher Bangard, Klaus Prenzel

¹Department of Visceral and Vascular Surgery, University of Cologne, Joseph-Stelzmann-Strasse 9, 50931, Cologne, Germany. dirk.stippel@uni-koeln.de

Langenbeck'S Archives of Surgery

|February 22, 2008

Summary

Radiofrequency ablation (RFA) for liver cancer has high recurrence rates. This study identified key parameters, diameter of sphere ablated (D(S)) and distance to center (DC), to improve applicator placement and maximize ablation effectiveness.

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Published on: May 1, 2018

Area of Science:

Medical Physics
Interventional Radiology
Oncology

Background:

Radiofrequency ablation (RFA) is used for liver malignancies but faces challenges with local recurrence.
Optimizing applicator placement is crucial for improving RFA efficacy and reducing recurrence rates.

Purpose of the Study:

To evaluate parameters that define reproducible target volumes in RFA procedures.
To enhance applicator placement accuracy for liver tumor ablation.

Main Methods:

RFA was performed on perfused and nonperfused pig livers.
Measured parameters included diameters, margins, coagulation center, diameter of sphere ablated (D(S)), distance to center (DC), and volume.
Evaluated Rita XL (2 algorithms), LeVeen, and Rita Xli applicators using graphic overlays to visualize variability.

Main Results:

The diameter of the sphere ablated (D(S)) and distance to center (DC) best predict reproducible ablation volumes.
Significant differences in D(S) were observed across applicators in perfused livers (p < 0.001).
Graphic overlays revealed applicator-specific variability impacting system reliability.

Conclusions:

D(S) and DC are critical parameters for precise applicator placement in RFA.
Utilizing these specific values maximizes the likelihood of achieving complete tumor ablation.
Improved applicator positioning through D(S) and DC can potentially reduce local recurrences in liver RFA.