
Tobias Erlöv
Researcher

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
Summary, in 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.
Department/s
- Department of Biomedical Engineering
- Clinical Physiology and Nuclear Medicine, Malmö
- Cardiovascular Research - Immunity and Atherosclerosis
- EXODIAB: Excellence of Diabetes Research in Sweden
- EpiHealth: Epidemiology for Health
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.
Topic
- Medical Image Processing
Keywords
- shear stress
- longitudinal movement
- carotid artery
- non-invasive ultrasound
Status
Published
Research group
- Clinical Physiology, Malmö
- Cardiovascular Research - Immunity and Atherosclerosis
ISBN/ISSN/Other
- ISBN: 978-1-4577-0381-2