Inflow Jet Patterns of Unruptured Cerebral Aneurysms Based on the Flow Velocity in the Parent Artery: Evaluation Using 4D Flow MRI.

AJNR. American Journal of Neuroradiology
K FutamiM Nakada

Abstract

Inflow jet characteristics may be related to aneurysmal bleb formation and rupture. We investigated the visualization threshold on the basis of the flow velocity in the parent artery to classify the inflow jet patterns observed on 4D flow MR imaging. Fifty-seven unruptured aneurysms (24 bifurcation and 33 sidewall aneurysms) were subjected to 4D flow MR imaging to visualize inflow streamline bundles whose velocity exceeded visualization thresholds corresponding to 60%, 75%, and 90% of the maximum flow velocity in the parent artery. The shape of the streamline bundle was determined visually, and the inflow jet patterns were classified as concentrated, diffuse, neck-limited, and unvisualized. At the 75% threshold, bifurcation aneurysms exhibited a concentrated inflow jet pattern at the highest rate. At this threshold, the inflow jets were concentrated in 13 aneurysms (group C, 22.8%), diffuse in 18 (group D, 31.6%), neck-limited in 11 (group N, 19.3%), and unvisualized in 15 (group U, 26.3%). In 16 (28.1%) of the 57 aneurysms, the inflow jet pattern was different at various thresholds. Most inflow parameters, including the maximum inflow velocity and rate, the inflow velocity ratio, and the inflow rate ratio, were significantly h...Continue Reading

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Citations

Nov 23, 2019·AJNR. American Journal of Neuroradiology·K FutamiM Nakada
Nov 26, 2020·Journal of Magnetic Resonance Imaging : JMRI·Sung Won Youn, Jongmin Lee
Jan 24, 2021·Journal of Biomechanics·Trung Bao Le
Feb 28, 2021·Stroke and Vascular Neurology·Miaoqi ZhangRui Li
Mar 5, 2021·Journal of Stroke and Cerebrovascular Diseases : the Official Journal of National Stroke Association·Kouichi MisakiMitsutoshi Nakada

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