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A Method to Measure Shear Strain with High Spatial Resolution in the Arterial Wall Non-Invasively in vivo by Tracking Zero-Crossings of B-Mode Intensity Gradients

Author:
  • Tobias Erlöv
  • Åsa Rydén Ahlgren
  • Tomas Jansson
  • Hans W Persson
  • Jan Nilsson
  • Kjell Lindström
  • Magnus Cinthio
Publishing year: 2010
Language: English
Pages: 491-494
Publication/Series: Proceedings - IEEE Ultrasonics Symposium
Document type: Conference paper
Publisher: IEEE - Institute of Electrical and Electronics Engineers Inc.
Additional info: The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Department of Electrical Measurements (011022000), Experimental Cardiovascular Research Unit (013242110), Clinical Physiology and Nuclear Medicine Unit (013242320)

Abstract english

We have previously shown that there is a distinct longitudinal movement of the arterial wall during a cardiac cycle. This movement is larger in the intima-media region than in the adventitial region which introduces a substantial shear strain within the arterial wall. Our previously developed echo-tracking algorithm measured this shear strain by tracking two separate echoes, one in the intima-media region and one in the adventitia region and thus only a linear distribution was evaluated. The objective of this study was to suggest and evaluate a new improved method which can measure the intramural shear strain with higher spatial resolution and thereby provide more information on this new and rather unknown phenomenon. The mean maximum shear strain was 0.82 radians with a standard deviation of 0.17 radians and a CV-value of 14.2%. The total mean difference in measured longitudinal movement between the new and previous method was 10μm with a standard deviation of 90μm and a CV-value of 12.8%. The spatial distribution of the intramural shear strain seems to be very non-linear with a large amount of shear strain occurring in a small section around the transition between the media and adventitia layers.

Keywords

  • Medical Image Processing
  • shear stress
  • longitudinal movement
  • carotid artery
  • non-invasive ultrasound

Other

Published
  • Clinical Physiology, Malmö
  • Cardiovascular Research - Immunity and Atherosclerosis
  • ISBN: 978-1-4577-0381-2
E-mail: jan [dot] nilsson [at] med [dot] lu [dot] se

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