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

doi:10.1117/12.197606

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 proceeding › Conference contribution › Academic › peer-review

6 Citations (Scopus)

2 Downloads (Pure)

Abstract

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 language	English
Title of host publication	Medical Applications of Lasers II
Editors	Herbert J. Geschwind, J. Escourrou, Guilhem Godlewski, Hans H. Scherer, Stephen G. Bown, Frank Frank, Frederic Laffitte
Publisher	SPIE Press
Pages	296-303
Number of pages	8
ISBN (Electronic)	9780819416605
DOIs	https://doi.org/10.1117/12.197606
Publication status	Published - 23 Dec 1994
Externally published	Yes
Event	Medical Applications of Lasers II 1994 - Lille, France Duration: 6 Sep 1994 → 10 Sep 1994

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2327
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Medical Applications of Lasers II 1994
Country/Territory	France
City	Lille
Period	6/09/94 → 10/09/94

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10.1117/12.197606

10.1117_12.197606.fullFinal published version, 376 KB

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Molenaar, D. G., Van Vliet, R. J., Van Swol, C. F. P., Boon, T. A., & Verdaasdonck, R. M. (1994). Evaluation of laser prostatectomy devices by thermal imaging. In H. J. Geschwind, J. Escourrou, G. Godlewski, H. H. Scherer, S. G. Bown, F. Frank, & F. Laffitte (Eds.), Medical Applications of Lasers II (pp. 296-303). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2327). SPIE Press. https://doi.org/10.1117/12.197606

Molenaar, David G. ; Van Vliet, Remco J. ; Van Swol, Christiaan F.P. et al. / Evaluation of laser prostatectomy devices by thermal imaging. Medical Applications of Lasers II. editor / Herbert J. Geschwind ; J. Escourrou ; Guilhem Godlewski ; Hans H. Scherer ; Stephen G. Bown ; Frank Frank ; Frederic Laffitte. SPIE Press, 1994. pp. 296-303 (Proceedings of SPIE - The International Society for Optical Engineering).

@inproceedings{894f2e450a1c4fdba47c2f97859c98ab,

title = "Evaluation of laser prostatectomy devices by thermal imaging",

abstract = "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.",

author = "Molenaar, {David G.} and {Van Vliet}, {Remco J.} and {Van Swol}, {Christiaan F.P.} and Boon, {Tom A.} and Verdaasdonck, {Rudolf M.}",

note = "Publisher Copyright: {\textcopyright} 1994 SPIE.; Medical Applications of Lasers II 1994 ; Conference date: 06-09-1994 Through 10-09-1994",

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Molenaar, DG, Van Vliet, RJ, Van Swol, CFP, Boon, TA & Verdaasdonck, RM 1994, Evaluation of laser prostatectomy devices by thermal imaging. in HJ Geschwind, J Escourrou, G Godlewski, HH Scherer, SG Bown, F Frank & F Laffitte (eds), Medical Applications of Lasers II. Proceedings of SPIE - The International Society for Optical Engineering, vol. 2327, SPIE Press, pp. 296-303, Medical Applications of Lasers II 1994, Lille, France, 6/09/94. https://doi.org/10.1117/12.197606

Evaluation of laser prostatectomy devices by thermal imaging. / Molenaar, David G.; Van Vliet, Remco J.; Van Swol, Christiaan F.P. et al.

Medical Applications of Lasers II. ed. / Herbert J. Geschwind; J. Escourrou; Guilhem Godlewski; Hans H. Scherer; Stephen G. Bown; Frank Frank; Frederic Laffitte. SPIE Press, 1994. p. 296-303 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2327).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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T1 - Evaluation of laser prostatectomy devices by thermal imaging

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AU - Van Swol, Christiaan F.P.

AU - Boon, Tom A.

AU - Verdaasdonck, Rudolf M.

PY - 1994/12/23

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N2 - 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.

AB - 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.

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T3 - Proceedings of SPIE - The International Society for Optical Engineering

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BT - Medical Applications of Lasers II

A2 - Geschwind, Herbert J.

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A2 - Godlewski, Guilhem

A2 - Scherer, Hans H.

A2 - Bown, Stephen G.

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Molenaar DG, Van Vliet RJ, Van Swol CFP, Boon TA, Verdaasdonck RM. Evaluation of laser prostatectomy devices by thermal imaging. In Geschwind HJ, Escourrou J, Godlewski G, Scherer HH, Bown SG, Frank F, Laffitte F, editors, Medical Applications of Lasers II. SPIE Press. 1994. p. 296-303. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.197606

Evaluation of laser prostatectomy devices by thermal imaging

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