NDLI: Acoustic response of cartilage during laser-mediated stress relaxation

Content Provider	IEEE Xplore Digital Library
Author	Slater, J.G. Protsenko, D.E. Carbone, N. Jones, J.P. Wong, B.J.F.
Copyright Year	1995
Abstract	In this study, laser reshaping of porcine septal cartilage was performed using an Nd:YAG laser (/spl lambda/=1.32 /spl mu/m), while changes in acoustic waves were observed, in an attempt to develop technique to monitor the reshaping process. Concurrent measurements of strain (during tensile compression and tension, as well as flexure), temperature, and a 5-MHz ultrasonic signal were recorded during laser irradiation (/spl lambda/=1.32 /spl mu/m, 4 W, 13 s). The sample was set up in a water bath to enhance acoustic coupling. From the ultrasonic signal, both time of flight (TOF) and signal amplitude as reflected from the back wall of the cartilage were extracted and correlated with temperature and strain measurements. The onset of stress relaxation of the cartilage generally occurred between 50/spl deg/C and 60/spl deg/C. While TOF measurements indicated a generally constant increase in the speed of sound of the cartilage during the irradiation period, the amplitude of the reflected acoustic signal correlated directly with the stress relaxation of the cartilage. At the point of stress relaxation, the amplitude of the acoustic signal consistently attenuated to roughly 50% of its original magnitude.
Sponsorship	IEEE Lasers and Electro-Optics Society
Starting Page	846
Ending Page	853
Page Count	8
File Size	247189
File Format	PDF
ISSN	1077260X
Volume Number	11
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Strain measurement Laser transitions Acoustic measurements Ultrasonic variables measurement Tensile stress Acoustic waves Monitoring Tensile strain Temperature measurement Stress measurement ultrasound Laser cartilage reshaping Nd:YAG ultrasonic acoustic monitoring of stress relaxation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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