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Titolo:
FEEDBACK INTERSTITIAL DIODE-LASER (805 NM) THERMOTHERAPY SYSTEM - EX-VIVO EVALUATION AND MATHEMATICAL-MODELING WITH ONE AND 4-FIBERS
Autore:
IVARSSON K; OLSRUD J; STURESSON C; MOLLER PH; PERSSON BR; TRANBERG KG;
Indirizzi:
LUND UNIV,DEPT SURG S-22185 LUND SWEDEN LUND UNIV,DEPT SURG S-22185 LUND SWEDEN LUND UNIV,DEPT RADIAT PHYS S-22185 LUND SWEDEN LUND INST TECHNOL,DEPT PHYS S-22100 LUND SWEDEN
Titolo Testata:
Lasers in surgery and medicine
fascicolo: 2, volume: 22, anno: 1998,
pagine: 86 - 96
SICI:
0196-8092(1998)22:2<86:FID(NT>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
ND-YAG LASER; HYPERTHERMIA; TISSUE; LIGHT; DISTRIBUTIONS; TUMORS; LIVER;
Keywords:
COAGULATED VOLUME; HYPERTHERMIA; REGULATION; SAPPHIRE PROBE; TEMPERATURE DISTRIBUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
K. Ivarsson et al., "FEEDBACK INTERSTITIAL DIODE-LASER (805 NM) THERMOTHERAPY SYSTEM - EX-VIVO EVALUATION AND MATHEMATICAL-MODELING WITH ONE AND 4-FIBERS", Lasers in surgery and medicine, 22(2), 1998, pp. 86-96

Abstract

Background and Objective: In this study a newly developed microprocessor controlled power regulation and thermometry system integrated witha diode laser (805 nm wavelength) was evaluated with respect to temperature distribution, effectiveness of regulation, and ability to predict temperature distributions by computer simulation. Study Design/Materials and Methods: Experiments were performed in ground bovine muscle using either a single laser fiber or four-fibers. The target temperature at one (feedback) thermistor, placed 5 mm from one of the laser fibers, was set to 50 degrees C and was maintained by means of stepwise power regulation. The temperature distribution was monitored using multiple thermistor probes. A numerical model based on the bioheat equation was used to calculate the temperature distributions. Results: Temperature regulation was excellent with a tendency towards better regulation in the four-fiber than in the single-fiber experiments. Agreement between calculated and measured temperatures was good. The coagulated (>55 degrees C) and hyperthermic (>45 degrees C) volumes were 6 and 10-11 times larger, respectively, with four-fibers than with a single fiber. Conclusion: It is concluded that the stepwise power regulation system was efficient in maintaining a stable target temperature. The results indicate that the system can produce lesion volumes adequate for treating a relatively large tumor in a single session and that computersimulation may be useful for predicting temperature distribution. (C)1998 Wiley-Liss, Inc.

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Documento generato il 04/07/20 alle ore 11:54:46