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Ziegler, M. (2019). Improving Assessments of Hemodynamics and Vascular Disease. (Doctoral dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Improving Assessments of Hemodynamics and Vascular Disease
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Blood vessels are more than simple pipes, passively enabling blood to pass through them. Their form and function are dynamic, changing with both aging and disease. This process involves a feedback loop wherein changes to the shape of a blood vessel affect the hemodynamics, causing yet more structural adaptation. This feedback loop is driven in part by the hemodynamic forces generated by the blood flow, and the distribution and strength of these forces appear to play a role in the initiation, progression, severity, and the outcome of vascular diseases.

Magnetic Resonance Imaging (MRI) offers a unique platform for investigating both the form and function of the vascular system. The form of the vascular system can be examined using MR-based angiography, to generate detailed geometric analyses, or through quantitative techniques for measuring the composition of the vessel wall and atherosclerotic plaques. To complement these analyses, 4D Flow MRI can be used to quantify the functional aspect of the vascular system, by generating a full time-resolved three-dimensional velocity field that represents the blood flow.

This thesis aims to develop and evaluate new methods for assessing vascular disease using novel hemodynamic markers generated from 4D Flow MRI and quantitative MRI data towards the larger goal of a more comprehensive non-invasive examination oriented towards vascular disease. In Paper I, we developed and evaluated techniques to quantify flow stasis in abdominal aortic aneurysms to measure this under-explored aspect of aneurysmal hemodynamics. In Paper II, the distribution and intensity of turbulence in the aorta was quantified in both younger and older men to understand how aging changes this aspect of hemodynamics. A method to quantify the stresses generated by turbulence that act on the vessel wall was developed and evaluated using simulated flow data in Paper III, and in Paper V this method was utilized to examine the wall stresses of the carotid artery. The hemodynamics of vascular disease cannot be uncoupled from the anatomical changes the vessel wall undergoes, and therefore Paper IV developed and evaluated a semi-automatic method for quantifying several aspects of vessel wall composition. These developments, taken together, help generate more valuable information from imaging data, and can be pooled together with other methods to form a more comprehensive non-invasive examination for vascular disease.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 64
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1675
National Category
Medical Image Processing Biomedical Laboratory Science/Technology
Identifiers
urn:nbn:se:liu:diva-156311 (URN)10.3384/diss.diva-156311 (DOI)9789176850985 (ISBN)
Public defence
2019-05-31, Hugo Theorell, Norra Entrén, Campus US, Linköping, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2013-06077Swedish Research Council, 2017-03857Region Östergötland, LIO-752951
Available from: 2019-04-17 Created: 2019-04-12 Last updated: 2019-04-24Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9184-9234

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