In Vitro Assessment of Flow Variability in an Intracranial Aneurysm Model Using 4D Flow MRI and Tomographic PIV

被引：0
作者：
Rafael Medero
Katrina Falk
David Rutkowski
Kevin Johnson
Alejandro Roldán-Alzate
机构：
[1] University of Wisconsin-Madison,Department of Mechanical Engineering
[2] University of Wisconsin-Madison,Department of Radiology
[3] University of Wisconsin-Madison,Department of Biomedical Engineering
[4] University of Wisconsin-Madison,School of Medicine and Public Health
[5] University of Wisconsin-Madison,Department of Medical Physics
来源：
Annals of Biomedical Engineering | 2020年 / 48卷
关键词：
Intracranial aneurysm; Patient-specific; Experimental validation; Particle image velocimetry; Hemodynamics; Phase-contrast MRI; Wall shear stress;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：2484 / 2493
页数：9
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