Evaluation of laser prostatectomy devices by thermal imaging

David G. Molenaar, Remco J. Van Vliet, Christiaan F.P. Van Swol, Tom A. Boon, Rudolf M. Verdaasdonck

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

6 Citations (Scopus)
2 Downloads (Pure)


The treatment of benign prostatic hyperplasia (BPH) using Nd:YAG laser light has become an accepted alternative to TURP. However, there is no consensus to the dosimetry using the various laser devices. In our study, we evaluate the optical and thermal characteristics of 7 commercially available side firing laser probes. For the thermal analysis, an optical method was used based on 'Schlieren' techniques producing color images of the temperature distribution around the laser probe in water. Absolute temperatures were obtained after calibration measurements with thermocouples. Laser probes using metal mirrors for beam deflection heated up entirely. The local temperature rose up to 100 degrees centigrade, thus inducing vapor bubble formation that interfered with the emitted beam. Laser devices, using total internal reflection for deflection, showed far less heating primarily at the exit window, though Fresnel reflections and secondary beams indirectly heated up the (metal) housing of the tip. After clinical application, the absorption at the probe surface and hence temperature increased due to probe deterioration. Color Schlieren imaging is a powerful method for the thermal evaluation of laser devices. The thermal behavior of laser probes can be used as a guidance for the method of application and as an indication of the lifetime of the probes.

Original languageEnglish
Title of host publicationMedical Applications of Lasers II
EditorsHerbert J. Geschwind, J. Escourrou, Guilhem Godlewski, Hans H. Scherer, Stephen G. Bown, Frank Frank, Frederic Laffitte
PublisherSPIE Press
Number of pages8
ISBN (Electronic)9780819416605
Publication statusPublished - 23 Dec 1994
Externally publishedYes
EventMedical Applications of Lasers II 1994 - Lille, France
Duration: 6 Sep 199410 Sep 1994

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceMedical Applications of Lasers II 1994


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