title: Hemodynamic characterization of geometric cerebral aneurysm templates.
abstract: Hemodynamics are currently considered to a lesser degree than geometry in clinical practices for evaluating cerebral aneurysm (CA) risk and planning CA treatment. This study establishes fundamental relationships between three clinically recognized CA geometric factors and four clinically relevant hemodynamic responses. The goal of the study is to develop a more combined geometric/hemodynamic basis for informing clinical decisions. Flows within eight idealized template geometries were simulated using computational fluid dynamics and measured using particle image velocimetry under both steady and pulsatile flow conditions. The geometric factor main effects were then analyzed to quantify contributions made by the geometric factors (aneurysmal dome size (DS), dome-to-neck ratio (DNR), and parent-vessel contact angle (PV-CA)) to effects on the hemodynamic responses (aneurysmal and neck-plane root-mean-square velocity magnitude (Vrms), aneurysmal wall shear stress (WSS), and cross-neck flow (CNF)). Two anatomical aneurysm models were also examined to investigate how well the idealized findings would translate to more realistic CA geometries. DNR made the greatest contributions to effects on hemodynamics including a 75.05% contribution to aneurysmal Vrms and greater than 35% contributions to all responses. DS made the next greatest contributions, including a 43.94% contribution to CNF and greater than 20% contributions to all responses. PV-CA and several factor interactions also made contributions of greater than 10%. The anatomical aneurysm models and the most similar idealized templates demonstrated consistent hemodynamic response patterns. This study demonstrates how individual geometric factors, and combinations thereof, influence CA hemodynamics. Bridging the gap between geometry and flow in this quantitative yet practical way may have potential to improve CA evaluation and treatment criteria. Agreement among results from idealized and anatomical models further supports the potential for a template-based approach to play a useful role in clinical practice.
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States. Electronic address: priyanair@asu.edu.
authors.forename: Priya
authors.initials: P
authors.lastname: Nair
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States; Mayo Clinic Hospital, Phoenix, AZ, United States.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Chong
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: Aprinda
authors.initials: A
authors.lastname: Indahlastari
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: James
authors.initials: J
authors.lastname: Lindsay
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: David
authors.initials: D
authors.lastname: DeJeu
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: Varsha
authors.initials: V
authors.lastname: Parthasarathy
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: Justin
authors.initials: J
authors.lastname: Ryan
authors.affiliation: Endovantage, Scottsdale, AZ, United States.
authors.forename: Haithem
authors.initials: H
authors.lastname: Babiker
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: Christopher
authors.initials: C
authors.lastname: Workman
authors.affiliation: Department of Neurosurgery, Duke University School of Medicine, Durham, NC, United States.
authors.forename: L Fernando
authors.initials: LF
authors.lastname: Gonzalez
authors.affiliation: School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, United States; School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, United States.
authors.forename: David
authors.initials: D
authors.lastname: Frakes
mesh_terms: D006439:Hemodynamics; D057446:Hydrodynamics; D002532:Intracranial Aneurysm / Q000473:pathology / Q000503:physiopathology* / Q000628:therapy; D008953:Models, Anatomic; D011673:Pulsatile Flow; D033081:Shear Strength; D013314:Stress, Mechanical
keywords: Cerebral aneurysm; Computational fluid dynamics; Geometric template; Hemodynamics; Particle image velocimetry