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, Vol.6920 Article: 69200N.

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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)
Subjects:	R Medicine > R Medicine (General) T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > 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
Date:	2008
Volume:	Vol.6920
Page Range:	Article: 69200N
Identification Number:	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
URI:	http://wrap.warwick.ac.uk/id/eprint/29961

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