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Langenbeck's Archives of Surgery

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01-07-2009 | Original Article

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

Authors: Dirk L. Stippel, Christopher Bangard, Klaus Prenzel, Selim Yavuzyasar, Jürgen H. Fischer, Arnulf H. Hölscher

Published in: Langenbeck's Archives of Surgery | Issue 4/2009

Abstract

Background

The use of radiofrequency ablation (RFA) for treatment of liver malignancies is limited by the high rate of local recurrences. The aim of this experimental study was to evaluate parameters describing the reproducible target volume of a RFA procedure in order to facilitate better applicator placement.

Materials and methods

RFA was performed in perfused and nonperfused pig livers. The following parameters were measured: axial and transverse diameter, front margin, coagulation center, diameter of sphere ablated (D _S), distance to center (DC), and volume. Graphic overlays were utilized to visualize variability. Parameters were evaluated for Rita XL (2 algorithms), LeVeen, and Rita Xli applicators.

Results

The best prediction of a reproducibly ablated target volume can be made by the diameter of the sphere ablated and the distance of the applicator tip to center of the sphere (DC). The spheres were significantly different in diameter (D _S) depending on the applicator Rita XL 29 ± 6 mm, Rita XL^wet 35 ± 5 mm, LeVeen 35 ± 8 mm, Rita Xli 44 ± 5 mm (perfused livers, p < 0.001). Graphic overlay demonstrated differences in variability that can influence the reliability of the system.

Conclusions

D _S and DC as specific values for each applicator and algorithm facilitate a placement of the applicator relative to the target volume that maximizes the chance of complete ablation.

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Title: Which parameters are needed for targeting a multitined radiofrequency device—an approach to a simple algorithm
Authors: Dirk L. Stippel
Christopher Bangard
Klaus Prenzel
Selim Yavuzyasar
Jürgen H. Fischer
Arnulf H. Hölscher
Publication date: 01-07-2009
Publisher: Springer-Verlag
Published in: Langenbeck's Archives of Surgery / Issue 4/2009
Print ISSN: 1435-2443
Electronic ISSN: 1435-2451
DOI: https://doi.org/10.1007/s00423-008-0306-6

Keynote webinar | Spotlight on medication adherence

Springer Medicine

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

Abstract

Background

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Materials and methods

Results

Conclusions

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