A fluid-structure interaction model of the internal carotid and ophthalmic arteries for the noninvasive intracranial pressure measurement method

Misiulis, Edgaras; Diugys, Algis; Navakas, Robertas; Strigas, Nerijus

doi:10.1016/j.compbiomed.2017.03.014

Cited by 10 publications

(12 citation statements)

References 29 publications

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“…Therefore, the systematic errors are due to <∆ṕ>, difference in boundary conditions, which we will denote as p add , and artery compliance. In [11], only one value of ICP was considered of 10 mmHg and the bifurcation site of OA from internal carotid artery effect was incorporated and modeled, while in this study imaginary bifurcation site at boundary Γ 3 was prescribed to be immovable. In [11] it was obtained that ε S = -0.5 mmHg, p add,S = 0.26 mmHg, ε v = 1.1 mmHg, p add,v = 1.86 mmHg and ε с = 1.6 mmHg.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

“…In [11], only one value of ICP was considered of 10 mmHg and the bifurcation site of OA from internal carotid artery effect was incorporated and modeled, while in this study imaginary bifurcation site at boundary Γ 3 was prescribed to be immovable. In [11] it was obtained that ε S = -0.5 mmHg, p add,S = 0.26 mmHg, ε v = 1.1 mmHg, p add,v = 1.86 mmHg and ε с = 1.6 mmHg. While in this study, with ICP = 10 mmHg these values were ε S = -1.48 mmHg, p add,S = -0.356 mmHg, ε v = 1.84 mmHg, p add,v = -0.716 mmHg and ε с = -0.36 mmHg.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

“…, (26) . (27) Based on [11], the geometry was discretized into 71644 finite elements, with 49734 elements for blood domain, 13506 elements for tunica media domain, and 8404 elements for tunica adventitia domain.…”

Section: Crosssectionmentioning

confidence: 99%

“…The effects on systematic errors of ICP evaluation were analyzed in [10] were it was found that non-symmetrical boundary conditions affect the value of systematic errors. The transient three-dimensional numerical model of a straight internal carotid artery (ICA) and OA system, incorporating the isotropic hyperelastic artery wall of a non-zero width and blood flow interaction, was used to evaluate the pressure balance state based on the blood flow and artery characteristics [11]. The results of the numerical model [11] showed that the systematic error was composed of arterial pressure difference between IOA and EOA segments, boundary condition asymmetries and an additional pressure balance term, which was postulated to exist due to transient blood flow rate differences between IOA and EOA segments, which can be referenced as a compliance of the artery in the region between measurement locations.…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of systematic errors of a non-invasive intracranial pressure measurement

Misiulis¹,

Skarbalius²,

Džiugys³

2018

energetika

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Intracranial pressure (ICP) monitoring procedure can be applied to aid in secondary brain damage prevention. A high invasiveness of commonly used ICP measuring methods poses a risk of complications, and therefore new non-invasive methods are currently being developed. A promising non-invasive ICP measurement method is based on the existence of pressure balance state, which is driven by the unique morphological property of ophthalmic artery (OA). The value of ICP can be obtained by evaluating blood flow or artery characteristics in different OA segments, intracranial OA segment (IOA) and extracranial OA segment (EOA). In order to increase measurement accuracy, the systematic errors must be evaluated, which requires an implementation of a numerical model encompassing various physical phenomena. In this paper, a developed numerical model is presented, which was used to solve a transient fluid–structure interaction (FSI) problem of the pulsatile blood flow in a straight, physically meaningful anisotropic, hyperelastic OA, with ICP and external pressure (Pe) loads. It was found that the systematic error based on mean cross-sectional area difference between IOA and EOA segments was {–1.48, –1.37, –1.17} mmHg with ICP = {10, 20, 30} mmHg, respectively. The systematic error based on mean blood flow velocity difference between IOA and EOA segments was {–1.84, –1.76, –1.625} mmHg with ICP = {10, 20, 30} mmHg, respectively. The presented numerical model examined the worst-case scenario in terms of boundary conditions, which were immovable, while lengths of OA segments were physiologically relevant statistical means; however, the obtained systematic errors still met the clinical standards of ANSI/AAMI, where it is stated that the error should not exceed the ± 2 mmHg in the range of 0–20 mmHg of ICP. Boundary conditions and compliance affects the systematic error in both ways (reduce or increase it); this may explain the low systematic errors obtained in experimental studies by other authors.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Section: Crosssectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical evaluation of systematic errors of a non-invasive intracranial pressure measurement

Misiulis¹,

Skarbalius²,

Džiugys³

2018

energetika

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“…When considering the issues involving FSI, oversimplified constitutive models will impede the results of structural and fluid flow domains. Some recently proposed problems require a very careful consideration of the constitutive artery wall model, as small disturbances in the blood flow velocity field caused by small displacements of the artery wall needs to be reliably determined . Therefore, we adopt a constitutive model proposed by Holzapfel, Gasser, and Ogden and extended by other works, which to a great extent can reproduce the passive arterial wall mechanical behavior.…”

Section: Methodsmentioning

confidence: 99%

A comparative study of methods used to generate the arterial fiber structure in a clinically relevant numerical analysis

Misiulis

Džiugys

Navakas

et al. 2019

Numer Methods Biomed Eng

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The advanced constitutive material models of artery wall require the definition of the mean collagen fiber directions in the material configuration. There are several proposed methods; however, it is unclear how much does the fiber structures obtained by these methods differ one from the other and how much this difference may affect the results of the structural analysis of a clinically relevant scenario. Therefore, in this paper, we address this issue by presenting the results of the comparative study of our developed and currently state-of-the-art fiber definition methods. In addition, we present the verification of our developed numerical model that incorporates the extended Holzapfel-Gasser-Ogden (HGO) constitutive material model and the generalized prestressing algorithm (GPA). In the case of the patient-specific internal carotid artery (ICA), the percentage error of the mean fiber directions defined by different methods does not exceed 17.73% (at least 0.05%, at most 81.82%) and has negligible effect on the stress levels, as the percentage error of the mean circumferential Cauchy stress does not exceed 0.1%. Both fiber definition methods produce comparable fiber structure, but our proposed method has an advantage, as it does not depend on method and software used to model the arterial wall mechanics.

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Mathematical Modeling of Blood Flow in the Eye

Arciero

Carichino

Cassani

et al. 2019

Ocular Fluid Dynamics

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A fluid-structure interaction model of the internal carotid and ophthalmic arteries for the noninvasive intracranial pressure measurement method

Cited by 10 publications

References 29 publications

Numerical evaluation of systematic errors of a non-invasive intracranial pressure measurement

Numerical evaluation of systematic errors of a non-invasive intracranial pressure measurement

A comparative study of methods used to generate the arterial fiber structure in a clinically relevant numerical analysis

Mathematical Modeling of Blood Flow in the Eye

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