Advanced

Interstitial laser thermotherapy : Comparison between bare fibre and sapphire probe

Möller, Páll H. LU ; Lindberg, Lars LU ; Henriksson, Pär H. ; Persson, Bertil R.R. LU and Tranberg, Karl G. LU (1995) In Lasers in Medical Science 10(3). p.193-200
Abstract

A sapphire probe and a bare fibre were compared with respect to temperature control and distribution and light fluence in interstitial laser thermotherapy. Experiments were performed in processed liver using an Nd-YAG laser and output power levels of 1-4 W. The temperature was controlled at a distance of 10 mm using a feedback circuit with an automatic thermometry system and thermistor probes. With the sapphire probe, carbonization was rare at power levels of 1-2 W but was observed in half of the experiments at 3 W and in all experiments at 4 W. Using the bare fibre, carbonization was seen in almost all experiments. Absence of carbonization was associated with a moderate decrease in the penetration of light and excellent control of the... (More)

A sapphire probe and a bare fibre were compared with respect to temperature control and distribution and light fluence in interstitial laser thermotherapy. Experiments were performed in processed liver using an Nd-YAG laser and output power levels of 1-4 W. The temperature was controlled at a distance of 10 mm using a feedback circuit with an automatic thermometry system and thermistor probes. With the sapphire probe, carbonization was rare at power levels of 1-2 W but was observed in half of the experiments at 3 W and in all experiments at 4 W. Using the bare fibre, carbonization was seen in almost all experiments. Absence of carbonization was associated with a moderate decrease in the penetration of light and excellent control of the temperature, whereas carbonization led to rapid impairment of light penetration and temperature control. In addition, the temperature gradient was smaller with the sapphire probe than with the bare fibre or when carbonization was absent. It is concluded that a diffuser tip, such as the sapphire probe, may be preferable to the bare fibre for interstitial laser thermotherapy because it gives a smaller temperature gradient and helps to avoid carbonization which results in preserved light penetration and improved temperature control.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Feedback control, Hyperthermia, Light penetration, Nd-YAG laser, Temperature distribution
in
Lasers in Medical Science
volume
10
issue
3
pages
193 - 200
publisher
Springer
external identifiers
  • scopus:0029549134
ISSN
0268-8921
DOI
10.1007/BF02133331
language
English
LU publication?
yes
id
096e3985-3b69-4d67-ada8-c89a83f5ea90
date added to LUP
2019-06-15 17:03:17
date last changed
2020-08-16 06:47:04
@article{096e3985-3b69-4d67-ada8-c89a83f5ea90,
  abstract     = {<p>A sapphire probe and a bare fibre were compared with respect to temperature control and distribution and light fluence in interstitial laser thermotherapy. Experiments were performed in processed liver using an Nd-YAG laser and output power levels of 1-4 W. The temperature was controlled at a distance of 10 mm using a feedback circuit with an automatic thermometry system and thermistor probes. With the sapphire probe, carbonization was rare at power levels of 1-2 W but was observed in half of the experiments at 3 W and in all experiments at 4 W. Using the bare fibre, carbonization was seen in almost all experiments. Absence of carbonization was associated with a moderate decrease in the penetration of light and excellent control of the temperature, whereas carbonization led to rapid impairment of light penetration and temperature control. In addition, the temperature gradient was smaller with the sapphire probe than with the bare fibre or when carbonization was absent. It is concluded that a diffuser tip, such as the sapphire probe, may be preferable to the bare fibre for interstitial laser thermotherapy because it gives a smaller temperature gradient and helps to avoid carbonization which results in preserved light penetration and improved temperature control.</p>},
  author       = {Möller, Páll H. and Lindberg, Lars and Henriksson, Pär H. and Persson, Bertil R.R. and Tranberg, Karl G.},
  issn         = {0268-8921},
  language     = {eng},
  month        = {09},
  number       = {3},
  pages        = {193--200},
  publisher    = {Springer},
  series       = {Lasers in Medical Science},
  title        = {Interstitial laser thermotherapy : Comparison between bare fibre and sapphire probe},
  url          = {http://dx.doi.org/10.1007/BF02133331},
  doi          = {10.1007/BF02133331},
  volume       = {10},
  year         = {1995},
}