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Proceedings Paper

Tissue temperature measurements during interstitial laser therapy using Cr3+-doped crystals at the fiber tip
Author(s): Jenny Svensson; Anna Ralsgard; Thomas Johansson; Stefan Andersson-Engels
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Paper Abstract

In this project a technique to optically measure the temperature is evaluated. The measurement is to be performed through optical fibres during photodynamic laser treatments or laser thermo therapy of malignant tumours. For this technique Cr3+-doped crystals were used. The lifetime of the ions’ fluorescence were measured, since the fluorescence is strongly temperature dependent. A piece of a crystal was attached to the tip of an optical fibre. The crystal was excited at 635 nm, which is the wavelength most frequently used for photodynamic treatment. An accuracy in the temperature measurement of ± 0.3 °C was obtained for Cr:LiSAF in the region 20 - 70 °C. This is well within the requirements for this application. Alexandrite and Cr:YAG were also evaluated in this study, also yielding a very good accuracy. A laser treatment was simulated using pork chop as tissue phantom and the temperature was measured.

Paper Details

Date Published: 16 October 2003
PDF: 12 pages
Proc. SPIE 5142, Therapeutic Laser Applications and Laser-Tissue Interactions, (16 October 2003); doi: 10.1117/12.500565
Show Author Affiliations
Jenny Svensson, Lund Univ. Medical Laser Ctr. (Sweden)
Anna Ralsgard, Lund Univ. Medical Laser Ctr. (Sweden)
Thomas Johansson, Lund Univ. Medical Laser Ctr. (Sweden)
Stefan Andersson-Engels, Lund Univ. Medical Laser Ctr. (Sweden)


Published in SPIE Proceedings Vol. 5142:
Therapeutic Laser Applications and Laser-Tissue Interactions
Rudolf W. Steiner, Editor(s)

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