Feedback interstitial diode laser (805 nm) thermotherapy system: Ex vivo evaluation and mathematical modeling with one and four-fibers
Ivarsson, K ; Olsrud, J ; Sturesson, C ; Moller, P. H ; Persson, Bertil R LU
and Tranberg, K. G
(1998)
In Lasers in Surgery and Medicine
22(2).
p.86-96
- Abstract
- Background and Objective: In this study a newly developed microprocessor controlled power regulation and thermometry system integrated with a 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... (More)
- Background and Objective: In this study a newly developed microprocessor controlled power regulation and thermometry system integrated with a 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 computer simulation may be useful for predicting temperature distribution. (C) 1998 Wiley-Liss, Inc. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2258426
- author
- Ivarsson, K
; Olsrud, J
; Sturesson, C
; Moller, P. H
; Persson, Bertil R
LU
and Tranberg, K. G
- organization
- publishing date
- 1998
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Lasers in Surgery and Medicine
- volume
- 22
- issue
- 2
- pages
- 86 - 96
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:0031937140
- ISSN
- 0196-8092
- DOI
- 10.1002/(SICI)1096-9101(1998)22:2<86::AID-LSM4>3.0.CO;2-S
- language
- English
- LU publication?
- yes
- id
- 29291337-de7b-48af-9a9c-69d1c6fab51c (old id 2258426)
- date added to LUP
- 2016-04-04 09:05:41
- date last changed
- 2022-01-29 08:12:05
@article{29291337-de7b-48af-9a9c-69d1c6fab51c,
abstract = {{Background and Objective: In this study a newly developed microprocessor controlled power regulation and thermometry system integrated with a 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 computer simulation may be useful for predicting temperature distribution. (C) 1998 Wiley-Liss, Inc.}},
author = {{Ivarsson, K and Olsrud, J and Sturesson, C and Moller, P. H and Persson, Bertil R and Tranberg, K. G}},
issn = {{0196-8092}},
language = {{eng}},
number = {{2}},
pages = {{86--96}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Lasers in Surgery and Medicine}},
title = {{Feedback interstitial diode laser (805 nm) thermotherapy system: Ex vivo evaluation and mathematical modeling with one and four-fibers}},
url = {{https://lup.lub.lu.se/search/files/5229939/2297294.pdf}},
doi = {{10.1002/(SICI)1096-9101(1998)22:2<86::AID-LSM4>3.0.CO;2-S}},
volume = {{22}},
year = {{1998}},
}