Abstract
Aneurysm rupture has been suggested to be related to aneurysm geometry, morphology, and complex flow activity; therefore, understanding aneurysm-specific hemodynamics is crucial. 4D Flow MRI has been shown to be a feasible tool for assessing hemodynamics in intracranial aneurysms with high spatial resolution. However, it requires averaging over multiple heartbeats and cannot account for cycle-to-cycle hemodynamics variations. This study aimed to assess cycle-to-cycle flow dynamics variations in a patient-specific intracranial aneurysm model using tomographic particle image velocimetry (tomo-PIV) at a high image rate under pulsatile flow conditions. Time-resolved and time-averaged velocity flow fields within the aneurysm sac and estimations of wall shear stress (WSS) were compared with those from 4D Flow MRI. A one-way ANOVA showed a significant difference between cardiac cycles (p value < 0.0001); however, differences were not significant after PIV temporal and spatial resolution was matched to that of MRI (p value 0.9727). This comparison showed the spatial resolution to be the main contributor to assess cycle-to-cycle variability. Furthermore, the comparison with 4D Flow MRI between velocity components, streamlines, and estimated WSS showed good qualitative and quantitative agreement. This study showed the feasibility of patient-specific in-vitro experiments using tomo-PIV to assess 4D Flow MRI with high repeatability in the measurements.
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09 January 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10439-022-03119-4
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Acknowledgments
The authors are grateful to the Medical Physics Department for the MRI acquisition support at the University of Wisconsin-Madison, Carson Hoffman for his assistance with writing scripts in MATLAB, and Dr. Charles Strother for his critical comments preparing the manuscript. This study was partially supported by a K12 Career Development Award, K12DK100022. Funding was provided by American Heart Association (Grant No. 14SDG19690010).
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The authors state that there are no conflicts of interest related to this research study.
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Medero, R., Falk, K., Rutkowski, D. et al. In Vitro Assessment of Flow Variability in an Intracranial Aneurysm Model Using 4D Flow MRI and Tomographic PIV. Ann Biomed Eng 48, 2484–2493 (2020). https://doi.org/10.1007/s10439-020-02543-8
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DOI: https://doi.org/10.1007/s10439-020-02543-8