Determination of the temperature-dependent electric conductivity of liver tissue ex vivo and in vivo: Importance for therapy planning for the radiofrequency ablation of liver tumours

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
Urte ZurbuchenJörg-Peter Ritz

Abstract

Knowledge about the changes in the electric conductivity during the coagulation process of radiofrequency ablation of the liver is a prerequisite for the predictability of produceable thermonecrosis in the liver. Continuous measurements of the electric conductivity sigma in ex vivo porcine liver (n = 25) were done during the coagulation and cooling process at the temperature range of the radiofrequency ablation at a frequency of 470 kHz relevant for the radiofrequency ablation. Measurements of the electric conductivity were performed in both perfused porcine liver (n = 3) and a human surgical specimen from a colorectal liver metastasis. At a body temperature of 37 degrees C, conductance sigma was 0.41 siemens per metre (0.32 S/m; 0.52 S/m). Conductance sigma increased continuously and uniformly at a temperature of 77 degrees C. Maximum conductance sigma with 0.79 S/m (0.7 S/m; 0.87 S/m) was reached at 80 degrees C. A continuous reduction of conductance was observed during the cooling phase. At 37 degrees C, the specific conductance sigma in the healthy perfused porcine liver was 0.52 S/m, 0.55 S/m and 0.57 S/m (mean 0.55 S/m). The electric conductivity of the human colorectal liver metastasis was clearly higher. Changes in the ...Continue Reading

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Citations

Jan 15, 2014·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Fanrui FuWufan Chen
Feb 18, 2012·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Yaojun ZhangMinshan Chen
Jul 15, 2015·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Stefaan MulierYicheng Ni
Sep 6, 2012·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Stefaan MulierYicheng Ni
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Jul 13, 2016·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Franz G M PochKai S Lehmann
Jun 25, 2016·Journal of Hepato-biliary-pancreatic Sciences·Kai S LehmannUrte Zurbuchen
Oct 25, 2016·Medical Engineering & Physics·Bin DuanChee-Kong Chui
Sep 23, 2016·International Journal for Numerical Methods in Biomedical Engineering·Yansheng JiangYicheng Ni
Feb 15, 2017·Surgical Innovation·Franz G M PochKai S Lehmann
Aug 2, 2016·IEEE Transactions on Bio-medical Engineering·Wafaa KarakiDiana-Andra Borca Tasciuc
Jun 6, 2018·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Kangwei ZhangLisa X Xu
Feb 20, 2019·Journal of Biomechanical Engineering·Wafaa KarakiSuvranu De
Aug 3, 2017·Medical & Biological Engineering & Computing·Ricardo PossebonYicheng Ni
Aug 4, 2020·Computer Methods in Biomechanics and Biomedical Engineering·Wafaa KarakiSuvranu De
Oct 9, 2018·Computational Mechanics·Wafaa KarakiSuvranu De
Feb 4, 2021·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Nikhil VaidyaKaren Veroy
Sep 4, 2021·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Chieh-Feng ChangJo-Ping Lee

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