Nonuniform Moving Boundary Method for Computational Fluid Dynamics Simulation of Intrathecal Cerebrospinal Flow Distribution in a Cynomolgus Monkey

A detailed quantification and understanding of cerebrospinal fluid (CSF) dynamics may improve detection and treatment of central nervous system (CNS) diseases and help optimize CSF system-based delivery of CNS therapeutics. This study presents a computational fluid dynamics (CFD) model that utilizes...

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Vydáno v:Journal of biomechanical engineering Ročník 139; číslo 8
Hlavní autoři: Khani, Mohammadreza, Xing, Tao, Gibbs, Christina, Oshinski, John N, Stewart, Gregory R, Zeller, Jillynne R, Martin, Bryn A
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.08.2017
Témata:
Animals
Cerebrospinal Fluid - diagnostic imaging
Cerebrospinal Fluid - physiology
Computer Simulation
Hydrodynamics
Macaca fascicularis
Magnetic Resonance Imaging
Male
ISSN:1528-8951, 1528-8951
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Shrnutí:A detailed quantification and understanding of cerebrospinal fluid (CSF) dynamics may improve detection and treatment of central nervous system (CNS) diseases and help optimize CSF system-based delivery of CNS therapeutics. This study presents a computational fluid dynamics (CFD) model that utilizes a nonuniform moving boundary approach to accurately reproduce the nonuniform distribution of CSF flow along the spinal subarachnoid space (SAS) of a single cynomolgus monkey. A magnetic resonance imaging (MRI) protocol was developed and applied to quantify subject-specific CSF space geometry and flow and define the CFD domain and boundary conditions. An algorithm was implemented to reproduce the axial distribution of unsteady CSF flow by nonuniform deformation of the dura surface. Results showed that maximum difference between the MRI measurements and CFD simulation of CSF flow rates was <3.6%. CSF flow along the entire spine was laminar with a peak Reynolds number of ∼150 and average Womersley number of ∼5.4. Maximum CSF flow rate was present at the C4-C5 vertebral level. Deformation of the dura ranged up to a maximum of 134 μm. Geometric analysis indicated that total spinal CSF space volume was ∼8.7 ml. Average hydraulic diameter, wetted perimeter, and SAS area were 2.9 mm, 37.3 mm and 27.24 mm2, respectively. CSF pulse wave velocity (PWV) along the spine was quantified to be 1.2 m/s.
Bibliografie:ObjectType-Article-1
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ISSN:1528-8951
1528-8951
DOI:10.1115/1.4036608