Impact of cysts during radio frequency (RF) lesioning in deep brain structures: a simulation and in-vitro study
2007 (English)In: Journal of Neural Ingeneering, ISSN 1741-2560, Vol. 4, no 2, 87-95 p.Article in journal (Refereed) Published
Radiofrequency lesioning of nuclei in the thalamus or the basal ganglia can be used to reduce symptoms caused by e.g. movement disorders such as Parkinson's disease. Enlarged cavities containing cerebrospinal fluid (CSF) are commonly present in the basal ganglia and tend to increase in size and number with age. Since the cavities have different electrical and thermal properties compared with brain tissue, it is likely that they can affect the lesioning process and thereby the treatment outcome. Computer simulations using the finite element method and in vitro experiments have been used to investigate the impact of cysts on lesions' size and shape. Simulations of the electric current and temperature distributions as well as convective movements have been conducted for various sizes, shapes and locations of the cysts as well as different target temperatures. Circulation of the CSF caused by the heating was found to spread heat effectively and the higher electric conductivity of the CSF increased heating of the cyst. These two effects were together able to greatly alter the resulting lesion size and shape when the cyst was in contact with the electrode tip. Similar results were obtained for the experiments.
Place, publisher, year, edition, pages
IOP Electronic Journals , 2007. Vol. 4, no 2, 87-95 p.
Electrosurgery, RF ablation, Brain, Blood perfusion, Finite-element method
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-13997DOI: 10.1088/1741-2560/4/2/009OAI: oai:DiVA.org:liu-13997DiVA: diva2:22414
Johannes D. Johansson, Dan Loyd, Karin Wårdell and Joakim Wren, Impact of cysts during radio frequency (RF) lesioning in deep brain structures: a simulation and in-vitro study, 2006, Journal of Neural Ingeneering, (4), 2, 87-95.
Copyright: Institute of Physics Publishing