title: Relationships of the group velocity of the time-reversed Lamb wave with bone properties in cortical bone in vitro.
abstract: The present study aims to investigate the feasibility of using the time-reversed Lamb wave as a new method for noninvasive characterization of long cortical bones. The group velocity of the time-reversed Lamb wave launched by using the modified time reversal method was measured in 15 bovine tibiae, and their correlations with the bone properties of the tibia were examined. The group velocity of the time-reversed Lamb wave showed significant positive correlations with the bone properties (r=0.55-0.81). The best univariate predictor of the group velocity of the time-reversed Lamb wave was the cortical thickness, yielding an adjusted squared correlation coefficient (r2) of 0.64. These results imply that the group velocity of the time-reversed Lamb wave, in addition to the velocities of the first arriving signal and the slow guided wave, could potentially be used as a discriminator for osteoporosis.
authors.affiliation: Department of Physics, Kangwon National University, Chuncheon 24341, Republic of Korea. Electronic address: acustica@kangwon.ac.kr.
authors.forename: Kang Il
authors.initials: KI
authors.lastname: Lee
authors.affiliation: Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea.
authors.forename: Suk Wang
authors.initials: SW
authors.lastname: Yoon
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002417:Cattle; D000071538:Cortical Bone; D005240:Feasibility Studies; D055595:Mechanical Phenomena; D013977:Tibia; D013997:Time Factors
keywords: Cortical bone; Group velocity; Osteoporosis; Time-reversed Lamb wave; Ultrasonic guided wave