Summary
Concerning hyperthermia treatment, knowledge of time-temperature and of temperature distributions within tumour volumes is essential in order to obtain the maximal therapeutic effect. New techniques are developed to overcome these difficulties. Two different heat sources, the contact Nd:YAG laser system and the automatically controlled high frequency current are investigated. In a defined volume of 1cm3, the laser system reaches 45 °C after 1.8 s exposure with 15 W output power. The high frequency current reaches 45 °C with 48 s exposition with 18.75 W output current. Both heat sources present an exponential decrease of the temperature profile depending on the distance and prove efficient for inducing anti-tumoural hyperthermia. The tissue heat clearance is compensated for by intermittent laser and high frequency current application.
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Busch W (1866) Über den Einfluss welchen heftigere Erysipeln zuweilen auf organisierte Neubildungen ausüben. Verhandl Naturh Preuss Rhein, Westphal 23: 28–30
Snyder CD (1908) A comparative study of the temperature coefficients of the velocities of various physiological actions. Am J Physiology 22: 309–334
Saleman M, Samaras GM (1981) Hyperthermia for brain tumors: biophysical rationale. Neurosurgery 9 (3): 327–335
Pettigrew RT, Galt JM, Ludgate CM, Horn DB, Smith AN (1974) Circulatory and biochemical effects of whole body hyperthermia. Br J Surg 61: 727–730
Daikuzono N, Suzuki S, Tajiri H, Tsunekawa H, Ohyama M, Joffe SN (1988) Laserthermia: a new computer—controlled contact Nd:YAG system for interstitial local hyperthermia. Lasers in Surgery and Medicine 8: 254–258
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Nowak, G., Rentzsch, O., Terzis, A.J.A. et al. Induced hyperthermia in brain tissue: Comparison between contact Nd:YAG laser system and automatically controlled high frequency current. Acta neurochir 102, 76–81 (1990). https://doi.org/10.1007/BF01402191
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DOI: https://doi.org/10.1007/BF01402191