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Improving Assessments of Hemodynamics and Vascular Disease
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...
Towards Personalized Models of the Cardiovascular System Using 4D Flow MRI
Current diagnostic tools for assessing cardiovascular disease mostly focus on measuring a given biomarker at a specific spatial location where an abnormality is suspected. However, as a result of the dynamic and complex nature of the cardiovascular system, the analysis of isolated biomarkers is generally not sufficient to characterize the pathological mechanisms behind a disease. Model-based approaches that integrate the mechanisms through which different components interact, and present possibilities for system-level analyses, give us a better picture of a patient’s overall health status. One of the main goals of cardiovascular modelling is the development of personalized models based on ...
The Cosmographia of Sebastian Münster
Sebastian Münster's Cosmographia was an immensely influential book that attempted to describe the entire world across all of human history and analyse its constituent elements of geography, history, ethnography, zoology and botany. First published in 1544 it went through thirty-five editions and was published in five languages, making it one of the most important books of the Reformation period. Beginning with a biographical study of Sebastian Münster, his life and the range of his scholarly work, this book then moves on to discuss the genre of cosmography. The bulk of the book, however, deals with the Cosmographia itself, offering a close reading of the 1550 Latin edition (the last and de...
Automated Assessment of Blood Flow in the Cardiovascular System Using 4D Flow MRI
Medical image analysis focuses on the extraction of meaningful information from medical images in order to facilitate clinical assessment, diagnostics and treatment. Image processing techniques have gradually become an essential part of the modern health care system, a consequence of the continuous technological improvements and the availability of a variety of medical imaging techniques. Magnetic Resonance Imaging (MRI) is an imaging technique that stands out as non-invasive, highly versatile, and capable of generating high quality images without the use of ionizing radiation. MRI is frequently performed in the clinical setting to assess the morphology and function of the heart and vessels....
Myocardial Tissue Characterization Using Magnetic Resonance Imaging
In cardiovascular disease, which is the most common cause of death in the world, early diagnosis is crucial for disease outcome. Diagnosis of cardiovascular disease can be challenging, though. Quantification of myocardial T1 and T2 relaxation times with MRI has demonstrated to be a promising method for characterizing myocardial tissue, but long measurement times have hampered clinical use. The overall aim of this doctoral thesis was to develop, validate and, in patient studies, evaluate a very fast three-dimensional method for simultaneous quantification of myocardial T1 and T2 relaxation times with whole coverage of the left ventricle. The 3D-QALAS method is presented in Paper I of this the...
