Computer modelling of an impedance-controlled pulsing protocol for RF tumour ablation with a cooled electrode
| Autor: | Enrique Berjano, José Bon, M. J. Rivera, Macarena Trujillo, Fernando Burdío |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ablation Techniques
Cancer Research Finite element method Materials science TECNOLOGIA DE ALIMENTOS Physiology Radio Waves Thermal ablation Tumor ablation 030218 nuclear medicine & medical imaging TECNOLOGIA ELECTRONICA 03 medical and health sciences 0302 clinical medicine Physiology (medical) Neoplasms Electric Impedance Humans Computer Simulation Electrical impedance Electrodes business.industry Radiofrequency ablation Temperature Models Theoretical Pulsing protocol Impedance control Tumour ablation Blood Cooled electrode Liver 030220 oncology & carcinogenesis Electrode Optoelectronics Computer modelling business MATEMATICA APLICADA |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| ISSN: | 1464-5157 |
| Popis: | [EN] Purpose: To develop computer models to mimic the impedance-controlled pulsing protocol implemented in radiofrequency (RF) generators used for clinical practice of radiofrequency ablation (RFA), and to assess the appropriateness of the models by comparing the computer results with those obtained in previous experimental studies.Methods: A 12-min RFA was modelled using a cooled electrode (17G, 3cm tip) inserted in hepatic tissue. The short (transverse) diameter of the coagulation zone was assessed under in vivo (with blood perfusion (BP) and considering clamping) and ex vivo (at 21 degrees C) conditions. The computer results obtained by programming voltage pulses were compared with current pulses.Results: The differences between voltage and current pulses were noticeable: using current instead of voltage allows larger coagulation zones to be created, due to the higher energy applied by current pulses. If voltage pulses are employed the model can accurately predict the number of roll-offs, although the waveform of the applied power is clearly not realistic. If current voltages are employed, the applied power waveform matches well with those reported experimentally, but there are significantly fewer roll-offs. Our computer results were overall into the ranges of experimental ones.Conclusions: The proposed models reproduce reasonably well the electrical-thermal performance and coagulation zone size obtained during an impedance-controlled pulsing protocol. This work was supported by the Spanish Plan Estatal de Investigacion, Desarrollo e Innovacion Orientada a los Retos de la Sociedad under grant number TEC2014-52383-C3-R (TEC2014-52383-C3-1-R). The authors alone are responsible for the content and writing of the paper. |
| Databáze: | OpenAIRE |
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