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Analysis of temperature measurement for monitoring radio-frequency brain lesioning
Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.
Linköping University, Department of Biomedical Engineering. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-0012-7867
Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
2001 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 39, no 2, 255-262 p.Article in journal (Refereed) Published
Abstract [en]

During ablative neurosurgery of movement disorders, for instance therapy of Parkinson's disease, temperature monitoring is crucial. This study aims at a quantitative comparison of measurement deviations between the maximum temperature located outside the lesioning electrode and two possible thermocouple locations inside the electrode. In order to obtain the detailed temperature field necessary for the analysis, four finite element models associated with different surroundings and with different power supplies are studied. The results from the simulations show that both the power level and the power density as well as the surrounding medium affect the temperature measurement and the temperature field in general. Since the maximum temperature is located outside the electrode there will always be a deviation in time and level between the measured and the maximum temperature. The deviation is usually 2–7 s and 3–12°C, depending on, for example, the thermocouple location and surrounding medium. Therefore, not only the measured temperature but also the relation between measured and maximum temperature must be accounted for during therapy and device design.

Place, publisher, year, edition, pages
2001. Vol. 39, no 2, 255-262 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-29926DOI: 10.1007/BF02344810Local ID: 15351OAI: oai:DiVA.org:liu-29926DiVA: diva2:250745
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13
In thesis
1. Characterisation and modelling of radio-frequency lesioning in functional neurosurgery
Open this publication in new window or tab >>Characterisation and modelling of radio-frequency lesioning in functional neurosurgery
2001 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the characterisation and modelling of the radio frequency (RF) lesioning with emphasis on size estimation in functional neurosurgery. A computer-assisted video system has been set up for standardised test and documentation of protein clots generated by RF-lesioning electrodes in an albumin solution. A standardised test is essential in comparing assessed results of the size and shape of protein clots generated using different parameters. This is beneficial to both the manufacturer oflesioning electrodes as well as the surgeon.

In an animal study, performed analogously to thalamotomy in man, the correlation in size between in vitro protein clots and in vivo lesions has been investigated. The result shows a high correlation between protein clots and lesions observed on MR images; and lesions observed on MR images and corresponding coagulated tissue in histological sectionings. This actualises the value of presurgical electrode tests to validate the electrode function and lesion size in vitro.

A finite element model has been set-up in order to facilitate studies of the growth and the temperature distribution during the lesioning process. Of the utmost importance is the finding of a difference in temperature between maximum temperature, located outside the electrode, compared to the intra-electrode (thermocouple) temperature.

A method for real time monitoring of lesion growth and estimation of lesion size utilising static and/or Doppler broadened laser light is proposed. Implemented in a surgical-assist system, this could give valuable guidance to the surgeon as to whether the desired lesion size is obtained or not and keep the destruction precise, but to a minimum.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2001. 70 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 693
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-29440 (URN)14786 (Local ID)91-7373-033-5 (ISBN)14786 (Archive number)14786 (OAI)
Public defence
2001-06-01, Elsa Brändströmssalen, Universitetssjukhuset, Linköping, 09:15 (Swedish)
Opponent
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2013-02-26

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Wren, JoakimEriksson, OlaWårdell, KarinLoyd, Dan

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