Kernspintomographische in-vitro Temperaturmessung bei der Ho:YAG Laseranwendung in der Bandscheibe

Translated title of the contribution: MRI aided in-vitro temperature measurement of Ho:YAG laser application in the intervertebral disc

A. Berden, T. Breitling, P. M. Jakob, V. Krenn, A. Haase, W. E. Siebert, C. Hendrich

Research output: Contribution to journalArticlepeer-review

Abstract

In the present study the possibility of dynamic measurement of temperature resulting from irradiating intervertebral discs by laser is demonstrated. Fresh human specimens were irradiated using a Ho:YAG laser via a 400 μm fiber under clinical conditions. Measurement of temperature was performed in two parallel planes of the disc using an experimental 7T-MRI system by means of the proton-shift method. After an irradiation with 1J at 10 Hz for 5s a maximum increase in temperature of 80° was found in the plane of the fiber extending 6 × 2 mm. At a distance of 5 mm a maximum increase in temperature of 44° was ob-served over a similar area. Using a spatial resolution of 550 μm the measuring time could be reduced below 500 μs. These results demonstrate the possibility of using MRI methods for dynamic temperature measurement. For the first time the high spatial and temporary resolution of the proton-shift method could also be proved for organoid structures. The examination of clinical laser parameters allows an estimation of the thermal damage caused by percutaneous laser disc decompression.

Translated title of the contributionMRI aided in-vitro temperature measurement of Ho:YAG laser application in the intervertebral disc
Original languageGerman
Pages (from-to)158-162
Number of pages5
JournalLasermedizin
Volume12
Issue number3-4
StatePublished - 1996
Externally publishedYes

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