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Lamb waves detection in a bovine cortical tibia using scanning laser vibrometry
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Hapsara, Manik and Iliescu, Daciana (2008) Lamb waves detection in a bovine cortical tibia using scanning laser vibrometry. In: Medical Imaging 2008 Conference, San Diego, California, Feb 17-19, 2008. Published in: Medical Imaging 2008: Ultrasonic Imaging and Signal Processing, Volume 6920 Article: 69200N. ISBN 978-0-8194-7104-8. doi:10.1117/12.770277 ISSN 0277-786X.
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Official URL: http://dx.doi.org/10.1117/12.770277
Abstract
Most of the techniques for generating and detecting ultrasonic Lamb waves (e.g. angle-beam piezoelectric transducers, micro-electro mechanical systems (MEMS), comb and interdigital transducers, phased array transducers, and piezoceramic transducers) require a firm physical contact with the measured objects. For objects with highly irregular surfaces such as bones, it will be very difficult to produce a good contact. Thus, a non-contact Lamb wave measurement technique, the scanning laser vibrometry, is proposed in this paper to examine a bovine cortical tibia in vitro. The ultrasonic Lamb waves used had the center frequency of 84KHz. The waves were generated using a planar transducer which was coupled with a cone-shaped resonant vibrator. Only the fundamental modes of a(0) and s(0) were expected to occur. 2-Dimensional images of the Lamb waves traveling in the bone were recorded. The scan results represent out-of-plane vibration of the surface of the bone. Lamb wave modes were verified with further post-processing analyses. In time-domain, time-history prediction of the modes is fitted onto the original detected signal as to confirm their common rising time for each mode. A frequency-domain method, i.e. wavelet analysis, is also employed to define the traveling modes and their group velocity. The expected modes can be clearly defined at the center frequency. Additionally, what seemed to be a new mode, a,, was generated and detected at the higher frequency of the responses.
Item Type: | Conference Item (Paper) | ||||
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Subjects: | R Medicine > R Medicine (General) T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Lamb waves, Bones -- Analysis, Imaging systems in medicine, Lasers in medicine | ||||
Journal or Publication Title: | Medical Imaging 2008: Ultrasonic Imaging and Signal Processing | ||||
Publisher: | Society of Photo-Optical Instrumentation Engineers | ||||
ISBN: | 978-0-8194-7104-8 | ||||
ISSN: | 0277-786X | ||||
Editor: | McAleavey, SA and DHooge, J | ||||
Official Date: | 2008 | ||||
Dates: |
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Volume: | Volume 6920 | ||||
Page Range: | Article: 69200N | ||||
DOI: | 10.1117/12.770277 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | Medical Imaging 2008 Conference | ||||
Type of Event: | Conference | ||||
Location of Event: | San Diego, California | ||||
Date(s) of Event: | Feb 17-19, 2008 |
Data sourced from Thomson Reuters' Web of Knowledge
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