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Velocity tracking - a novel method for quantitative analysis of longitudinal myocardial function
KTH, School of Technology and Health (STH), Medical Engineering.
KTH, School of Technology and Health (STH), Medical Engineering. (Skolan för teknik och hälsa)ORCID iD: 0000-0002-5795-9867
KTH, School of Technology and Health (STH), Medical Engineering.
KTH, School of Technology and Health (STH), Medical Engineering.
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2007 (English)In: Journal of the American Society of Echocardiography, ISSN 0894-7317, E-ISSN 1097-6795, Vol. 20, no 7, 847-856 p.Article in journal (Refereed) Published
Abstract [en]

Doppler tissue imaging is a method for quantitative analysis of longitudinal myocardial velocity. Commercially available ultrasound systems can only present velocity information using a color Dopplerbased overlapping continuous color scale. The analysis is time-consuming and does not allow for simultaneous analysis in different projections. We have developed a new method, velocity tracking, using a stepwise color coding of the regional longitudinal myocardial velocity. The velocity data from 3 apical projections are presented as static and dynamic bull's-eye plots to give a 3-dimensional understanding of the function of the left ventricle. The static bull's-eye plot can display peak systolic velocity, late diastofic tissue velocity, or the sum of peak systolic velocity and early diastolic tissue velocity. Conversely, the dynamic bull's-eye plot displays how the myocardial velocities change over one heart cycle. Velocity tracking allows for a fast, simple, and hituitive visual analysis of the regional longitudinal contraction pattern of the left ventricle with a great potential to identify characteristic pathologic patterns.

Place, publisher, year, edition, pages
Elsevier, 2007. Vol. 20, no 7, 847-856 p.
Keyword [en]
coronary-artery-disease; tissue doppler; stress echocardiography; diastolic dysfunction; heart-failure; diagnosis; motion; wall
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-11756DOI: 10.1016/j.echo.2006.11.024ISI: 000248738600008Scopus ID: 2-s2.0-34347386268OAI: oai:DiVA.org:kth-11756DiVA: diva2:280833
Note

QC 20100727

QC 20151223

Available from: 2009-12-11 Created: 2009-12-11 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Quantification and Visualization of Cardiovascular Function using Ultrasound
Open this publication in new window or tab >>Quantification and Visualization of Cardiovascular Function using Ultrasound
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

There is a large need for accurate methods detecting cardiovascular diseases, since they are one of the leading causes of mortality in the world, accounting for 29.3% of all deaths. Due to the complexity of the cardiovascular system, it is very challenging to develop methods for quantification of its function in order to diagnose, prevent and treat cardiovascular diseases. Ultrasound is a technique allowing for inexpensive, noninvasive imaging, but requires an experienced echocardiographer. Nowadays, methods like Tissue Doppler imaging (TDI) and Speckle tracking imaging (STI), measuring motion and deformation in the myocardium and the vessel walls, are getting more common in routine clinical practice, but without a proper visualization of the data provided by these methods, they are time-consuming and difficult to interpret. Thus, the general aim of this thesis was to develop novel ultrasound-based methods for accurate quantification and easily interpretable visualization of cardiovascular function.

Five methods based on TDI and STI were developed in the present studies. The first study comprised development of a method for generation of bull’s-eye plots providing a color-coded two-dimensional visualization of myocardial longitudinal velocities. The second study proposed the state diagram of the heart as a new circular visualization tool for cardiac mechanics, including segmental color-coding of cardiac time intervals. The third study included development of a method describing the rotation pattern of the left ventricle by calculating rotation axes at different levels of the left ventricle throughout the cardiac cycle. In the fourth study, deformation data from the artery wall were tested as input to wave intensity analysis providing information of the ventricular – arterial interaction. The fifth study included an in-silico feasibility study to test the assessment of both radial and longitudinal strain in a kinematic model of the carotid artery.

The studies showed promising results indicating that the methods have potential for the detection of different cardiovascular diseases and are feasible for use in the clinical setting. However, further development of the methods and both quantitative comparison of user dependency, accuracy and ease of use with other established methods evaluating cardiovascular function, as well as additional testing of the clinical potential in larger study populations, are needed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. x, 72 p.
Series
Trita-STH : report, ISSN 1653-3836 ; 2009:6
Keyword
Ultrasound, Tissue Doppler imaging, Speckle tracking imaging, cardiovascular function, visualization, quantification
National Category
Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:kth:diva-11762 (URN)978-91-7415-524-2 (ISBN)
Public defence
2010-01-22, 3-221, Alfred Nobels Alle 10, Huddinge, 08:30 (Swedish)
Opponent
Supervisors
Note
QC 20100727Available from: 2009-12-14 Created: 2009-12-11 Last updated: 2010-10-04Bibliographically approved

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Larsson, Matilda

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