Myocordial segmentation of time-resolved 3D phase-contrast MRI
(English)Manuscript (preprint) (Other academic)
Time-resolved three-dimensional (3D) phase-contrast MRI can be used to study 3D cardiac blood flow patterns and myocardial motion. The image contrast between myocardium and blood in 3D MRl is often inadequate for clear orientation and border delineation, however. To improve the accuracy and ease of segmentation, we developed a method based on a particle trace technique for time-resolved 3D cardiac velocity vector fields. A particle trace trajectory that follows the blood flow and the myocardial motion is obtained by integration of the velocity field over time. The myocardium can be differentiated by using the magnitude image data in combination with the trajectory's velocities and the expected behavior of the myocardial particle traces, that is, that traces starting in the myocardium will return to their starting point at the end of a cardiac cycle. The myocardial probability obtained in this way can be used for visualization, which eliminates the need for acquiring additional two-dimensional images. It also serves as the basis for border delineation, allowing quantification of important clinical parameters such as ventricular volume and mass.
MR velocity imaging, three-dimensional visualization, particle trace, trajectory, heart, border delineation, contrast enhancement
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-89144OAI: oai:DiVA.org:liu-89144DiVA: diva2:607263