title: [System continuity and energy distribution in laser-induced thermo therapy (LITT)].
abstract: OBJECTIVE
  Evaluation of the continuity and energy distribution of a laser system for laser-induced thermo therapy.
  
  
  METHODS
  For evaluation of the continuity of laser optical devices, laser generating units and optical fibers of three different manufactures (Dornier, Hüttinger, Somatex), we used the equipment to generate a laser beam of 25 Watt for 60 minutes. Measurements of the applied energy were done sequentially with two MY Test (Fa. Hüttinger) units. We also performed two in vitro ablations of animal liver tissue with different fiber optics [Mikrodom A 13-0540, Microflexx REF A 13-0561 (Hüttinger), Diffusor-Tip H-6111-T 3, Diffusor H-6111-T 4 (Dornier), Somaflex-Diffusor (Somatex)] over 20 minutes at- an energy flow of 25 J per second. We then evaluated the geometry of coagulation.
  
  
  RESULTS
  The different equipment used for our tests showed differences of a maximum of 10 %. Some components did not work properly in certain configurations even though the manufacturer assured it would. We saw significant differences in the ablation characteristics of the different fiber optics, especially in axial and frontal directions.
  
  
  CONCLUSIONS
  Knowledge of the different characteristics in energy distribution and ablation characteristics are an important factor in performing a successful laser-induced thermo therapy.
authors.affiliation: Klinik für Strahlenheilkunde, Charité Campus Virchow-Klinikum, Medizinische Fakultät der Humboldt Universität zu Berlin. maciej.pech@charite.de
authors.forename: M
authors.initials: M
authors.lastname: Pech
authors.forename: M
authors.initials: M
authors.lastname: Werk
authors.forename: A
authors.initials: A
authors.lastname: Beck
authors.forename: A
authors.initials: A
authors.lastname: Stohlmann
authors.forename: J
authors.initials: J
authors.lastname: Ricke
mesh_terms: D000818:Animals; D002417:Cattle; D004867:Equipment Design; D006801:Humans; D006979:Hyperthermia, Induced / Q000295:instrumentation*; D007834:Lasers; D008099:Liver / Q000473:pathology; D008113:Liver Neoplasms / Q000473:pathology / Q000556:secondary / Q000628:therapy*; D055096:Optical Devices; D013696:Temperature
vernacular_title: Systemkonstanz und Energieverteilung bei Laser-induzierter interstitieller Thermotherapie (LITT).