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Proceedings Paper

Acoustic measurements during holmium:YAG laser ablation of cadaveric human temporal bone: preliminary observations
Author(s): Brian Jet-Fei Wong M.D.; Lisa Gibbs; Joseph Neev; Janet Shanks
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Paper Abstract

Pulsed IR and UV lasers have been suggested for use in middle ear surgery due to decreased thermal trauma, precise ablation characteristics, and potential fiberoptic delivery. While there has been much focus on the thermal and photoacoustic events that occur during pulsed laser ablation of hard tissue, there are few studies that look at the acoustic energy generated from these devices from an audiologic standpoint. In this study, the mastoid cavities of cadaveric human temporal bones were irradiated with a Ho:YAG laser (lambda equals 2.12 micrometer) with the following parameters: 5, 10, and 15 Hz pulse repetition rate and 1, 2, 4, 6, 8, and 10 W average power. During ablation, acoustic measurements were made using a sound level meter held 5 cm away from the target site. With each set of laser parameters, the sound intensity (dB SPL) exceeded 85 dB. Peak intensity measurements of 125 dB were measured, and a saturation effect was noted above 4 W or 500 mJ/pulse. The clinical significance of these findings is discussed and the acoustical aspects of middle ear function and noise trauma are reviewed.

Paper Details

Date Published: 22 May 1997
PDF: 9 pages
Proc. SPIE 2970, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VII, (22 May 1997); doi: 10.1117/12.275042
Show Author Affiliations
Brian Jet-Fei Wong M.D., Veterans Administration Medical Ctr./Longbeach, Univ. of California/Irvine School of Medi, (United States)
Lisa Gibbs, Veterans Administration Medical Ctr./Longbeach (United States)
Joseph Neev, Beckman Laser Institute and Medical Clinic (United States)
Janet Shanks, Univ. of California/Irvine School of Medicine and Veterans Administration Medical Ctr./Loh (United States)

Published in SPIE Proceedings Vol. 2970:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VII
R. Rox Anderson M.D.; Harvey Lui M.D.; Michail M. Pankratov; Kenneth Eugene Bartels D.V.M.; Gerhard J. Mueller; Graham M. Watson M.D.; Reza S. Malek M.D.; Lawrence S. Bass M.D.; Lloyd P. Tate V.D.M.; Hans-Dieter Reidenbach; Kenneth Eugene Bartels D.V.M.; R. Rox Anderson M.D.; Lawrence S. Bass M.D.; Aaron P. Perlmutter M.D.; Kenton W. Gregory M.D.; David M. Harris; David M. Harris; Harvey Lui M.D.; Reza S. Malek M.D.; Gerhard J. Mueller; Michail M. Pankratov; Aaron P. Perlmutter M.D.; Hans-Dieter Reidenbach; Lloyd P. Tate V.D.M.; Graham M. Watson M.D., Editor(s)

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