NDLI: Unexpected anisotropic behavior of ultrasound attenuation after collagen cross-linking in porcine tendons

Content Provider	IEEE Xplore Digital Library
Author	Takiuchi, S. Marsh, J.N. Hall, C.S. Lanza, G.M. Wickline, S.A.
Copyright Year	2001
Description	Author affiliation: Nat. Cardiovascular Center, Osaka, Japan (Takiuchi, S.)
Abstract	Progressive collagen cross-linking is a feature of many cardiovascular conditions (e.g., aging, diabetes, remodeling) and may contribute to impaired ventricular relaxation. However, it is not known whether cross-linking affects anisotropic tissue material properties more in one direction than another. We hypothesized that biological tissue comprising a highly ordered collagen matrix (porcine tendon) would manifest a directional dependence of the physical effects of cross-links that could be quantitatively delineated with ultrasound. Fresh porcine flexor tendons were sliced in 2-mm planes parallel (n=7) and perpendicular (n=7) to the tissue fiber axis for attenuation measurements (1-7 MHz). Tendons subjected to cross-linking treatment were immersed in 10% formalin, and control tendons in normal saline solution. Attenuation measurements were made immediately after immersion for both tendon groups at numerous intervals for 1 hr. The attenuation coefficient of the samples insonified perpendicular to the collagen fibers increased after formalin fixation over 1-hr period, while attenuation for parallel measurements decreased at selected frequencies during the first 20 min and subsequently increased modestly by 1 hr. Although the molecular mechanism responsible for the unexpected decrease in attenuation in the parallel direction as compared with the increase in the perpendicular direction is not clear, it may reflect rapid alterations in directionally dependent viscous and/or elastic components that contribute to material properties of well-ordered biological tissues.
Sponsorship	Ultrasonics, Ferroelectr., & Frequency Control Soc
Starting Page	1253
Ending Page	1256
File Size	422337
Page Count	4
File Format	PDF
ISBN	0780371771
DOI	10.1109/ULTSYM.2001.991947
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Ultrasonic imaging Tendons Attenuation measurement Material properties Biological tissues Cardiology Aging Diabetes Frequency measurement
Content Type	Text
Resource Type	Article

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