Print Email Facebook Twitter Spatial-temporal pathline clustering based on FTLE fields Title Spatial-temporal pathline clustering based on FTLE fields Author Van Leeuwen, C. Contributor Vilanova, A. (mentor) Van der Geest, R.J. (mentor) Faculty Electrical Engineering, Mathematics and Computer Science Department Computer Graphics and Visualization Programme Computer Science Media and Knowledge Engineering Date 2014-05-14 Abstract Cardiac flow acquisition is a young and ongoing field of research which provides us with a vast amount of unsteady 3D blood flow data of the heart (4D vector fields). These 4D vector fields of the heart are used in clinical research to gain insight in the flow patterns within the heart which in turn can be used to gain a better understanding of the pathogenesis of cardiovascular diseases. The temporal, 3D dimensional nature and spatial freedom of the blood flow within the heart all add up to the complexity of the blood flow data which can be a challenge to interpret without a proper visualization. The biggest challenge would be the occlusion of relevant flow patterns due to visual clutter. This work describes a visualization technique called Spatial-temporal Clustering based on Finite Time Lyapunov Exponents, that aims to circumvent the challenges posed by the structural complexity of the flow and give a concise and insightful representation of the blood flow patterns within the heart. This technique uses pathlines to visualize the blood flow of which the placement is determined by a seeding strategy based on a clustering of a scalar metric extracted from the 4D vector fields. This scalar metric is the Finite Time Lyapunov Exponent that describes the temporal separation of pathlines. This results in seeding regions (clusters) that create pathline bundles that share the same temporal separation in time and thereby reduce the visual clutter. Aside from the main visualization technique this works also introduces a novel probing technique that highlights the base principles of the FTLE fields to provide the user with a better understanding of how a FTLE field works. Subject FTLEvector fieldshierarchical clusteringmedical imagingflow visualizationinteraction To reference this document use: http://resolver.tudelft.nl/uuid:3017aa81-50b9-45b3-842d-97eba0958f16 Embargo date 2014-05-14 Part of collection Student theses Document type master thesis Rights (c) 2014 Van Leeuwen, C. Files PDF main.pdf 10.27 MB Close viewer /islandora/object/uuid:3017aa81-50b9-45b3-842d-97eba0958f16/datastream/OBJ/view