We read with interest the study by Futami et al,1 “Identification of Vortex Cores in Cerebral Aneurysms on 4D Flow MRI.” They described the visualization, complexity, and stability of vortex cores on 4D flow MR imaging in a series of 40 cerebral aneurysms. Discriminating single, stable, vortex cores from complex flow patterns with temporarily unstable vortices, they found an association between a complex vortical flow pattern and complex aneurysm morphology. Thus, they concluded that the identification of vortex core flow patterns on 4D flow MR imaging may help to stratify aneurysm rupture risk. Moreover, they explained the mathematic definition of a vortex core line and referred to other previous research using computational fluid dynamics simulation data models that describe the phenomenon of vortex cores with cerebral aneurysm models.2,3
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